Page 20 - 新思维数学活动用书4 样章

1.3 Understanding place value

9 Here are four number cards.

A eight hundred and fifty B five hundred and eight

C five hundred and eighty D fifty eight

Write the letter of the card that is the answer to:

a 85 × 10 b 5800 ÷ 10 c 5800 ÷ 100

d 58 × 10 e 580 ÷ 10 f 50 800 ÷ 100

10 Four students decompose the number 29 292.
Here are the results. One answer is incorrect.

A 9000 + 90 + 20 000 + 200 + 2

B 20 000 + 9000 + 200 + 90 + 2

C 2 + 200 + 20 000 + 90 + 9000

D 2 + 200 + 20 000 + 90 + 900

Which answer is incorrect?

Challenge

11 Write in words the largest number that can be made using all the digits

3, 1, 0, 9, 7 and 5.

19