Page 42 - Whole Numbers (Addition and Subtraction)

Unit Whole nUmbers:
4 Addition And sUbtrAction

4.1 Addition and subtraction facts and skills

100 can be formed by adding 30 and 70:
100 = 30 + 70 30 = 3 × 10
70 = 7 × 10
100 can be formed in different ways by numbers like 30 and
adding two multiples of 10, for example: 70 are called multiples
100 = 20 + 80 100 = 50 + 50 of 10.
200 is also a multiple
100 = 40 + 60 100 = 70 + 30
of 10 because
3 000 can be formed in different ways by 200 = 20 × 10.
adding two multiples of 100, for example:
3 000 = 1 400 + 1 600

3 000 = 2 000 + 1 000

We can also say:
3 000 can be expressed as the sum of two multiples of 100.

1. 1 000 = 600 + 400. Write number sentences to describe four
other ways in which 1 000 can be formed by adding two
multiples of 100.

2. Write number sentences to describe five different ways in which
2 500 can be formed by adding two different multiples of 100.

2 500 can be formed by adding three different multiples of 100,
for example:
2 500 = 1 000 + 800 + 700 2 500 = 900 +1 100 + 500
2 500 = 600 + 1 500 + 400 2 500 = 100 + 200 + 2 200

3. Write number sentences to describe five different ways
in which 3 000 can be formed by adding three different
multiples of 100.

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