Page 16 - 新思维数学学生用书6 样章

1.2 Rounding decimal numbers

3 Which of these numbers rounds to 5 when rounded to the nearest whole number?

4.35 4.05 4.5 5.05 4.55 5.35 5.5 5.53

Check your answers to questions 1 to 3 with your partner.

4 Round these numbers to the nearest tenth.

4.52 7.81 2.35 9.07

5 Which of these numbers rounds to 7.5 when rounded to the nearest tenth?

7.35 7.05 7.51 7.55 7.49 7.56 7.53

Check your answers to questions 4 and 5 with your partner.

6 Correct all the statements that are false.
A 3.04 is 3 when rounded to the nearest whole number and the nearest tenth.

B 5.03 is 5 when rounded to the nearest whole number and 5.0 when rounded to
the nearest tenth.

C 6.95 is 7 when rounded to the nearest whole number and 6.9 when rounded to

the nearest tenth.
Discuss your answers with your partner.

Make sure you explain the reasons you have given.
7 Round these measures to the nearest tenth.

55.55 litres 12.22 metres 35.45 kilograms

8 Choose the smallest number from this list that rounds to 1.
0.55 0.99 1.9 1.45 0.5 1.05 0

9 Jasper says, ‘7.97 is 8 when rounded to the nearest whole number and is also 8

when rounded to the nearest tenth.’
Is Jasper correct?

Explain your answer.

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