3 round a number to 1 significant figure - white rose maths · 2020-05-01 · round a number to 1...

Round a number to 1 significant figure 1 Some numbers are written in a table. Underline the first significant figure in each of the numbers. Then complete the other columns. The first one has been done for you. Number Place value of 1st significant figure Number rounded to 1 significant figure 73 Tens 70 730 758 7,300 7,780 704,000 7.9 0.71 2 Round the numbers to 1 significant figure. a) 328 e) 89.6 b) 1,719 f) 83.67 c) 1,219 g) 9.84 d) 83 h) 96.9 3 Alex rounds 459 to 1 significant figure. This is 500 to 1 significant figure. Alex a) Is Alex correct? ________ Explain why. b) Rounding to 1 significant figure is always the same as rounding to the nearest 100 Ron Is Ron correct? ________ Talk about it with a partner. 4 Which of these numbers could have been rounded to 1 significant figure? Tick your answers. 80.08 800 8 0.8 80 8.08 808 0.08 0.80 0.0008 What do you notice about your answers? © White Rose Maths 2019

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Round a number to 1 significant figure

1 Some numbers are written in a table.

Underline the first significant figure in each of the numbers.

Then complete the other columns.

The first one has been done for you.

NumberPlace value of

1st significant figureNumber rounded to 1 significant figure

73 Tens 70

730

758

7,300

7,780

704,000

7.9

0.71

2 Round the numbers to 1 significant figure.

a) 328 e) 89.6

b) 1,719 f) 83.67

c) 1,219 g) 9.84

d) 83 h) 96.9

3 Alex rounds 459 to 1 significant figure.

This is 500 to 1 significant figure.

Alex

a) Is Alex correct? ________

Explain why.

b) Rounding to 1 significant

figure is always the same as rounding to the nearest 100

Ron

Is Ron correct? ________

Talk about it with a partner.

4 Which of these numbers could have been rounded to 1 significant figure?

Tick your answers.

80.08 800

8 0.8

80 8.08

808 0.08

0.80 0.0008

What do you notice about your answers?

Page 2: 3 Round a number to 1 significant figure - White Rose Maths · 2020-05-01 · Round a number to 1 significant figure 1 Some numbers are written in a table. Underline the first significant

b) Work out (6.7 + 2.3)

9.6 on your calculator.

Round the answer to 1 significant figure.

9 The attendance at a football match is 28,765

a) Round this number to 1 significant figure.

The number of people who attend a different football match is 60,000

rounded to 1 significant figure.

b) What is the greatest possible number of people who attended the

football match?

c) What is the least possible number of people who attended the

football match?

10 When does rounding to 1 significant figure give the same answer as

rounding to the nearest 10?

Talk about it with a partner and come up with a generalisation.

5 Dora is rounding numbers to 1 significant figure.

0.086 rounds to 0.1 as 8 is greater than 5, so the 0 goes up to a 1

Explain the mistake that Dora has made and write the correct answer.

6 Round the numbers to 1 significant figure.

a) 0.0451 b) 0.0000662

0.451 0.0002662

0.000451 2.000662

7 Tommy rounds 0.003872 to 1 significant figure.

0.004000

How could Tommy improve his answer?

8 Mo is rounding answers on his calculator

to 1 significant figure.

a) Mo says the answer is 99

Explain the mistake that Mo has made and write

the correct answer.

1 2 34 5 67 8 90

–

99.4938

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