Page 13 - 新思维数学学生用书6 样章

1 The number system

4 Add these numbers together and write the total number in words and digits.
a 2 + 0.1 + 0.03 + 0.009 b –900 – 9 – 0.9 – 0.009

c 20 + 5 + 0.4 + 0.03 + 0.001 d –3 – 0.4 – 0.08 – 0.001

Swap books with your partner and check their answers.

Read the numbers to each other.
5 Copy and complete.

37.844 = 30 + 7 + + 0.04 +

6 Petra is regrouping decimal numbers.

She spills ink on her work.

What number is under each ink blot?

a 0.546 = 0.4 + + 0.006

b 0.789 = 0.7 + 0.07 +

7 Find the missing numbers.

a 7.2 × 1000 = b 0.85 × 100 = c 4.28 × 10 =

d 670 ÷ 100 = e 151 ÷ 1000 = f 5.5 ÷ 10 =

Check your answers with your partner.
8 Look at these number cards.

A B C D E F G

1200 1.2 12 000 0.12 120 12 120 000

Write the letter of the card that is:
a one thousand times bigger than 12

b one hundredth of 12
c one thousandth of 120 000.

9 Mira divides a number by 10, then by 10 again and then by 10 again.

Her answer is 0.005.
What number did she start with?

12