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Starter Questions
1. 76 - 54
2. Calculate 75% of 400
3. What is the name of the shape will this net make.
4. Calculate the value of the missing angle. 36o
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Learning Intention
To explain how to divide by 20, 300, 4000 etc using our
knowledge so far.
Whole NumbersMultiply or Divide by 20,300,4000
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Whole Numbers
Example 1 : Calculate 20 x 52
20 can be written as 2 x 10 so we have :
By combining our knowledge so far of “multiplying / dividing by 10, 100, 1000”
and “multiplying / dividing by a single digit”
we can do harder calculations.We use a TWO step process.
Multiply or Divide by 20,300,4000
2 x 10 x 52 =
Step 1 : 10 x 52 = Step 2 : 2 x 520 =520 1040
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Whole Numbers
Example 2 : Calculate 44 x 30
30 can be written as 10 x 3 so we have :
Multiply or Divide by 20,300,4000
44 x 10 x 3 =
Step 1 : 44 x 10 = Step 2 : 440 x 3 =440 1320
Example 3 : Calculate 300 x 35
300 can be written as 3 x 100 so we have :3 x 100 x 35 =
Step 1 : 100 x35 = Step 2 : 3500 x 3 =3500 10500
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Whole Numbers
Example 4 : Calculate 16000 ÷ 200
To divide by 200, divide by 100 then divide by 2:
Multiply or Divide by 20,300,4000
16000 ÷ 100 ÷ 2 =
Step 1 : 16000 ÷ 100 =
Step 2 : 160 ÷ 2 =
160
80
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Whole Numbers
Example 5 : Calculate 120000 ÷ 6000
To divide by 6000, divide by 1000 then divide by 6:
Multiply or Divide by 20,300,4000
120000 ÷ 1000 ÷ 6 =
Step 1 : 120000 ÷ 1000 =
Step 2 : 120 ÷ 6 =
120
20
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Now try Ex 8Ch1 page 19
Whole NumbersMultiply or Divide by 20,300,4000