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Page 1: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 2: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

16 unshaded 4 unshaded

What proportion of the shape is shaded? 4

2015

=

For every shaded square, how many unshaded squares are there?

For 4 shadedFor 1 shaded

1 : 4

Page 3: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

A ratio is an expression which allows us to compare quantities.

Usually the words connected with ratio are “… for every …”

It behaves very much like a fraction

We can find equivalent ratios the

same way we find equivalent

fractions

Page 4: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Blue : Orange

2 : 4

1 : 2

For every blue square there are 2 orange squares

Blue : Orange

3 : 9

1 : 3

For every blue square there are 3 orange squares

Page 5: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Blue : Orange

4 : 6

2 : 3

For every 2 blue squares there are 3 orange squares

Blue : Orange

6 : 8

3 : 4

For every 3 blue squares there are 4 orange squares

Page 6: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Blue : Orange

6 : 15

2 : 5

For every 2 blue squares there are 5 orange squares

For every blue square there are 4 orange squares

Blue : Orange

2 : 8

1 : 4

Page 7: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Blue : Orange : Red

2 : 8 : 4

1 : 4 : 2

For every blue square there are 4 orange and 2 red squares

For every blue square there are 3 orange and 1 red square.

Blue : Orange : Red

4 : 12 : 4

1 : 3 : 1

Page 8: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 9: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

There were 12 sunny days and 18 rainy days last month.Write the ratio of sunny days to rainy days in its simplest form.

12 : 18

÷ 6

2 : 3

Mr Davis owns 4 pairs of grey socks and 10 pairs of black socks.Write the ratio of grey socks to black socks in its simplest form.

4 : 10

÷ 2

2 : 5

For every 2 sunny days there were 3 rainy days

For every 2 grey pairs, he owns 5 black pairs.

Page 10: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

8MB has 12 boys and 16 girls.Write the ratio of boys to girls in this class in its simplest form

A shirt consists of 70% cotton and 30% nylon.Write for this shirt its ratio of cotton to nylon in its simplest form.

12 : 16

÷ 4

3 : 4

70 : 30

÷ 10

7 : 3

For every 3 boys there are 4 girls.

For every 7 parts cotton there are 3 parts nylon.

Page 11: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 12: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

x 10

1.5 : 2.4

15 : 24 ÷ 3

5 : 8

x 10

1.2 : 2

12 : 20 ÷ 4

3 : 5

x 10

1.2 : 3 : 3.6

12 : 30 : 36

÷ 6

2 : 5 : 6

x 10

÷ 6

Cancel down (simplify) these ratios

Page 13: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

x 2

1.5 : 2.5

3 : 5

x 10

1.5 : 2

15 : 20÷ 5

3 : 4

Cancel down (simplify) these ratios

x 100

1.2 : 1.25

120 : 125÷ 5

24 : 25

Page 14: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Cancel down (simplify) these ratios

35

34:

x 100

0.6 : 0.75

÷ 15

60 : 75

4 : 5

12

34:

x 2

0.5 : 0.75

x 2

1 : 1.5

2 : 3

Page 15: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 16: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

What is the ratio of shaded parts to unshaded parts?

:2 8

:1 4

:4 6

:2 3

:4 10

:2 5

:8 6

:4 3

:6 12

:1 2

:14 2

:7 1

:8 20

:2 5

:6 9

:2 3

:6 8

:3 4

Page 17: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

What is the ratio of shaded parts to unshaded parts?

:10 20

:1 2

:9 15

:3 5

:4 18

:2 9:21 6

:7 2

Page 18: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

What is the ratio of shaded parts to unshaded parts?

:14 16

:7 8

:18 12

:3 2

:15 9

:5 3

:12 9

:4 3

Page 19: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 20: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

What is the ratio of shaded parts to unshaded parts?

:2 8

:1 4

:4 6

:2 3

:4 10

:2 5

:8 6

:4 3

:6 12

:1 2

:14 2

:7 1

:8 20

:2 5

:6 9

:2 3

:6 8

:3 4

Page 21: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

What is the ratio of shaded parts to unshaded parts?

:10 20

:1 2

:9 15

:3 5

:4 18

:2 9:21 6

:7 2

Page 22: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

What is the ratio of shaded parts to unshaded parts?

:14 16

:7 8

:18 12

:3 2

:15 9

:5 3

:12 9

:4 3

Page 23: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 24: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

10 : 15

÷ 5

2 : 3

12 : 16

÷ 4

3 : 4

4 : 10

÷ 2

2 : 5

5 : 15

÷ 5

1 : 3

3 : 12

÷ 3

1 : 4

8 : 12

÷ 4

2 : 3

Cancel down (simplify) these ratios

Page 25: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

15 : 25

÷ 5

3 : 5

12 : 32

÷ 4

3 : 8

4 : 14

÷ 2

2 : 7

15 : 18÷

3

5 : 6

3 : 24

÷ 3

1 : 8

8 : 72

÷ 8

1 : 9

Cancel down (simplify) these ratios

Page 26: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

40 : 25

÷ 5

8 : 5

8 : 36

÷ 4

2 : 9

42 : 24

÷ 6

7 : 4

3 : 18

÷ 3

1 : 6

9 : 30

÷ 3

3 : 10

25 : 60

÷ 5

5 : 12

Cancel down (simplify) these ratios

Page 27: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

40 : 25 : 10÷

5

8 : 5 : 2

÷ 5

9 : 12 : 30

÷ 3

3 : 4 : 10

÷ 3

2 : 6 : 8

÷ 2

1 : 3 : 4

÷ 2

8 : 20 : 8

÷ 4

2 : 5 : 2

÷ 4

Cancel down (simplify) these ratios

Page 28: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

18 : 30 : 12÷

6

3 : 5 : 2

÷ 6

15 : 12 : 24÷

3

5 : 4 : 8

÷ 3

14 : 21 : 28

÷ 7

2 : 3 : 4

÷ 7

8 : 40 : 16

÷ 8

1 : 5 : 2

÷ 8

Cancel down (simplify) these ratios

Page 29: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

x 10

1.5 : 2.4

15 : 24÷ 3

5 : 8

x 10

1.2 : 2

12 : 20÷ 4

3 : 5

x 10

1.2 : 3 : 3.6

12 : 30 : 36

÷ 6

2 : 5 : 6

x 10

÷ 6

Cancel down (simplify) these ratios

Page 30: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 31: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

10 : 15

÷ 5

2 : 3

12 : 16

÷ 4

3 : 4

4 : 10

÷ 2

2 : 5

5 : 15

÷ 5

1 : 3

3 : 12

÷ 3

1 : 4

8 : 12

÷ 4

2 : 3

Cancel down (simplify) these ratios

Page 32: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

15 : 25

÷ 5

3 : 5

12 : 32

÷ 4

3 : 8

4 : 14

÷ 2

2 : 7

15 : 18÷

3

5 : 6

3 : 24

÷ 3

1 : 8

8 : 72

÷ 8

1 : 9

Cancel down (simplify) these ratios

Page 33: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

40 : 25

÷ 5

8 : 5

8 : 36

÷ 4

2 : 9

42 : 24

÷ 6

7 : 4

3 : 18

÷ 3

1 : 6

9 : 30

÷ 3

3 : 10

25 : 60

÷ 5

5 : 12

Cancel down (simplify) these ratios

Page 34: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

40 : 25 : 10÷

5

8 : 5 : 2

÷ 5

9 : 12 : 30

÷ 3

3 : 4 : 10

÷ 3

2 : 6 : 8

÷ 2

1 : 3 : 4

÷ 2

8 : 20 : 8

÷ 4

2 : 5 : 2

÷ 4

Cancel down (simplify) these ratios

Page 35: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

18 : 30 : 12÷

6

3 : 5 : 2

÷ 6

15 : 12 : 24÷

3

5 : 4 : 8

÷ 3

14 : 21 : 28

÷ 7

2 : 3 : 4

÷ 7

8 : 40 : 16

÷ 8

1 : 5 : 2

÷ 8

Cancel down (simplify) these ratios

Page 36: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

x 10

1.5 : 2.4

15 : 24÷ 3

5 : 8

x 10

1.2 : 2

12 : 20÷ 4

3 : 5

x 10

1.2 : 3 : 3.6

12 : 30 : 36

÷ 6

2 : 5 : 6

x 10

÷ 6

Cancel down (simplify) these ratios

Page 37: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 38: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which of the following ratios is the odd one out?

2 : 3 4 : 6 14 : 21 6 : 8 24 : 36

16 : 12 20 : 15 4 : 3 28 : 21 3 : 4

12 : 30 6 : 15 5 : 2 10 : 25 4 : 10

20 : 70 4 : 14 10 : 35 6 : 21 6 : 16

8 : 12 6 : 10 21 : 35 15 : 25 9 : 15

2 : 8 16 : 6 56 : 21 80 : 30 32 : 12

Page 39: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which of the following ratios is the odd one out?

6 : 9 8 : 10 20 : 25 12 : 15 24 : 30

8 : 6 28 : 21 5 : 4 40 : 30 20 : 15

4 : 18 2 : 10 5 : 25 6 : 30 3 : 15

32 : 20 24 : 15 80 : 50 16 : 10 5 : 3

30 : 20 6 : 4 8 : 6 15 : 10 9 : 6

10 : 4 25 : 10 12 : 6 15 : 6 50 : 20

Page 40: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which of the following ratios is the odd one out?

0.2 : 0.3 4 : 6 1.4 : 2.1 1.6 : 1.8 2 : 3

2.4 : 1.8 2.8 : 2.1 0.5 : 0.4 40 : 30 4 : 3

1.2 : 3 0.6 : 1.5 0.5 : 0.2 1 : 2.5 0.4 : 1

32 : 20 2.4 : 1.5 8 : 5 1.6 : 1 1.5 : 0.9

0.8 : 1.2 0.6 : 1 21 : 35 1.5 : 2.5 3 : 5

1 : 0.4 2.5 : 1 1.2 : 0.6 5 : 3 10 : 6

Page 41: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 42: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which of the following ratios is the odd one out?

2 : 3 4 : 6 14 : 21 6 : 8 24 : 36

16 : 12 20 : 15 4 : 3 28 : 21 3 : 4

12 : 30 6 : 15 5 : 2 10 : 25 4 : 10

20 : 70 4 : 14 10 : 35 6 : 21 6 : 16

8 : 12 6 : 10 21 : 35 15 : 25 9 : 15

2 : 8 16 : 6 56 : 21 80 : 30 32 : 12

Page 43: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which of the following ratios is the odd one out?

6 : 9 8 : 10 20 : 25 12 : 15 24 : 30

8 : 6 28 : 21 5 : 4 40 : 30 20 : 15

4 : 18 2 : 10 5 : 25 6 : 30 3 : 15

32 : 20 24 : 15 80 : 50 16 : 10 5 : 3

30 : 20 6 : 4 8 : 6 15 : 10 9 : 6

10 : 4 25 : 10 12 : 6 15 : 6 50 : 20

Page 44: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which of the following ratios is the odd one out?

0.2 : 0.3 4 : 6 1.4 : 2.1 1.6 : 1.8 2 : 3

2.4 : 1.8 2.8 : 2.1 0.5 : 0.4 40 : 30 4 : 3

1.2 : 3 0.6 : 1.5 0.5 : 0.2 1 : 2.5 0.4 : 1

32 : 20 2.4 : 1.5 8 : 5 1.6 : 1 1.5 : 0.9

0.8 : 1.2 0.6 : 1 21 : 35 1.5 : 2.5 3 : 5

1 : 0.4 2.5 : 1 1.2 : 0.6 5 : 3 10 : 6

Page 45: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 46: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which two of the following ratios form a pair?

12 : 18 9 : 12 14 : 28 6 : 8 12 : 15

9 : 12 10 : 15 6 : 10 28 : 21 3 : 4

30 : 10 16 : 12 5 : 2 10 : 6 15 : 6

24 : 48 8 : 32 10 : 30 5 : 12 6 : 24

8 : 12 6 : 10 20 : 35 10 : 15 9 : 18

2 : 8 16 : 24 21 : 35 5 : 20 4 : 1

Page 47: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which two of the following ratios form a pair?

12 : 21 6 : 10 7 : 14 9 : 15 4 : 6

8 : 12 10 : 12 6 : 10 3 : 4 6 : 9

32 : 16 16 : 12 5 : 2 10 : 6 25 : 10

24 : 48 8 : 32 12 : 30 5 : 15 3 : 12

10 : 12 6 : 10 15 : 18 20 : 30 9 : 12

8 : 10 16 : 24 21 : 35 12 : 15 3 : 4

Page 48: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which two of the following ratios form a pair?

4 : 5 0.6 : 1 0.7 : 1.4 0.9 : 1.5 2 : 3

0.8 : 1.2 1 : 1.2 0.6 : 1 3 : 4 6 : 9

48 : 16 1.6 : 1.2 5 : 2 1 : 0.6 2.5 : 1

2.4 : 4.8 0.8 : 3.2 1.2 : 3 0.5 : 1.5 6 : 24

1 : 1.6 0.6 : 1 20 : 30 5 : 8 9 : 12

0.8 : 1 8 : 12 21 : 30 4 : 5 12 : 30

Page 49: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 50: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which two of the following ratios form a pair?

12 : 18 9 : 12 14 : 28 6 : 8 12 : 15

9 : 12 10 : 15 6 : 10 28 : 21 3 : 4

30 : 10 16 : 12 5 : 2 10 : 6 15 : 6

24 : 48 8 : 32 10 : 30 5 : 12 6 : 24

8 : 12 6 : 10 20 : 35 10 : 15 9 : 18

2 : 8 16 : 24 21 : 35 5 : 20 4 : 1

Page 51: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which two of the following ratios form a pair?

12 : 21 6 : 10 7 : 14 9 : 15 4 : 6

8 : 12 10 : 12 6 : 10 3 : 4 6 : 9

32 : 16 16 : 12 5 : 2 10 : 6 25 : 10

24 : 48 8 : 32 12 : 30 5 : 15 3 : 12

10 : 12 6 : 10 15 : 18 20 : 30 9 : 12

8 : 10 16 : 24 21 : 35 12 : 15 3 : 4

Page 52: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Which two of the following ratios form a pair?

4 : 5 0.6 : 1 0.7 : 1.4 0.9 : 1.5 2 : 3

0.8 : 1.2 1 : 1.2 0.6 : 1 3 : 4 6 : 9

48 : 16 1.6 : 1.2 5 : 2 1 : 0.6 2.5 : 1

2.4 : 4.8 0.8 : 3.2 1.2 : 3 0.5 : 1.5 6 : 24

1 : 1.6 0.6 : 1 20 : 30 5 : 8 9 : 12

0.8 : 1 8 : 12 21 : 30 4 : 5 12 : 30

Page 53: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Page 54: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas

Martha is 12 and her younger brother Jake is 6.

1. Write the ratio of Martha’s age : Jake’s age in its simplest form.

2. Write the ratio of Martha’s age : Jake’s age in its simplest form, in 4 years time.

3. Write the ratio of Martha’s age : Jake’s age in its simplest form, when Jake will be 24 years old.

now:

M : J

12 : 6

÷6÷6

2 : 1

in 4 years:

M : J

16 : 10

÷2÷2

8 : 5

when Jake is 24:

M : J

30 : 24

÷6÷6

5 : 4

Page 55: © T Madas. 16 unshaded 4 unshaded What proportion of the shape is shaded? For every shaded square, how many unshaded squares are there? For 4 shaded For

© T Madas