Page 21 - 新思维数学学生用书4 样章

1 Numbers and the number system

Exercise 1.3

1 a What is the value of the digit 9 in 950 302?

b What is the value of the digit 5?
2 Mia is thinking of a 5-digit whole number.

She says, ‘It has a 2 in the ten thousands place and in the tens place.

It has a 5 in the thousands place and in the ones place.

It has a 0 in the hundreds place.’

What number is Mia thinking of?

Write your number in words.

3 Decompose these numbers by copying and filling in the missing

numbers.
a 805 469 = + 5000 + + + 9

b 689 567 = 600 000 + + + 500 + +

c 508 208 = + + +

Discuss your answers with a partner.

4 Bruno says, ‘The largest 5-digit number is 1 less than a hundred

thousand.’ Is Bruno correct?

Explain your answer.
5 Which number sentence has a different missing number? What is it?

× 100 = 30 000 3 × 100 =

30 000 ÷ 100 = ÷ 10 = 30

× 100 = 3000 × 10 = 3000
6 Calculate:

a 67 × 10 b 40 ÷ 10

c 3600 ÷ 100 d 415 × 10

e 350 ÷ 10 f 35 × 100

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