Page 3 - Whole Numbers (Addition and Subtraction)

5. How much is each of the following?
(a) 6 + 6 (b) 6 + 7 (c) 7 + 7 (d) 7 + 8
(e) 5 + 5 (f) 10 + 5 (g) 15 + 5 (h) 20 + 5
(i) 35 − 5 (j) 30 − 5 (k) 25 − 5 (l) 20 − 5
(m) 7 + 3 (n) 6 + 4 (o) 5 + 5 (p) 4 + 6
(q) 10 − 3 (r) 10 − 7 (s) 10 − 4 (t) 10 − 6
(u) 8 + 2 (v) 16 + 4 (w) 26 + 4 (x) 36 + 4

To calculate 543 + 236 you can break the numbers down into
their place value parts:

500 40 3 200 30 6

You can add the hundreds parts 500 + 200 = 700 700

and the tens parts 40 + 30 = 70 70

and the units parts. 3 + 6 = 9 9

You can then build the answer up: 700 + 70 + 9 = 779
9
70
700

To add numbers in this way you need to know facts like those
below and many others very well.

8 + 5 = 13 80 + 50 = 130 50 + 80 = 130
13 − 8 = 5 130 − 50 = 80 6 + 4 = 10
60 + 40 = 100 70 + 30 = 100 800 − 300 = 500

You need to know the answer immediately, or you must be able to
work out the answers very quickly.

In this Unit, you will strengthen your knowledge of basic
addition facts, and you will learn ways to quickly form facts that
you do not know immediately.

2