Page 8 - Whole Numbers (Addition and Subtraction)

4. One candle is 15 units long and another candle is 7 units long.

(a) What is the difference between the two lengths?

(b) How long are these two candles together?
5. This candle was 18 cm long. It burned for half an hour and
then it was 5 cm shorter.

(a) How long is the candle after half
an hour of burning?

(b) In the next half hour of burning,
the candle loses another 5 cm in
length. How long is it now?

(c) How long do you think the
candle will be after one and a
half hours of burning?
6. How much is each of the following?

(a) 18 − 5 (b) 13 − 5 (c) 8 − 5
(d) 15 − 8 (e) 20 − 10 (f) 20 − 9
(g) 20 − 8 (h) 20 − 7 (i) 20 − 6
7. How much is each of the following?
(a) 9 − 4 (b) 12 − 5 (c) 12 − 7
(d) 15 − 9 (e) 5 + 8 (f) 11 − 7

8. Write the missing number in each of these number sentences.
(a) 6 + . . . = 10 (b) 10 − 6 = . . . (c) 10 − 4 = . . .
(d) 10 − 5 = . . . (e) 8 + . . . = 12 (f) 12 − 4 = . . .
(g) 8 + . . . = 18 (h) 18 − 8 = . . . (i) 8 + . . . = 17
(j) 17 − 8 = . . . (k) 8 + . . . = 15 (l) 15 − 8 = . . .

9. What should you add to 8 to get 14?

10. How much is 13 − 8?

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