Page 60 - Whole Numbers (Addition and Subtraction)

Unit Whole nUmbers:
11 Addition And sUbtrAction

11.1 Practise addition and subtraction

1. Calculate.
(a) 4 677 + 2 776 (b) 8 677 − 4 999
(c) 3 867 + 3 586 (d) 7 867 − 4 189

(e) 5 586 + 1 867 (f) 5 506 − 1 828
(g) 6 195 + 1 258 (h) 6 135 − 2 457

2. If your answers for questions 1(a), (c), (e) and (g) are not the
same, you have made mistakes. If this is the case, check your
calculations and correct the mistakes.

3. If your answers for questions 1(b), (d), (f) and (h) are not the
same, you have made mistakes. If this is the case, check your
calculations and correct the mistakes.

4. Don’t do the actual calculations. Just say which of these you
think will have the same answer.
(a) 5 674 + 3 298 (b) 5 746 + 3 928
(c) 3 674 + 5 298 (d) 5 274 + 3 698
(e) 5 896 + 3 274 (f) 5 278 + 3 694

5. Now do the calculations to check your answer for question 4.

6. Which of these calculations do you think will have the same
answer, if the calculations inside brackets are done first?
(a) 3 476 + (2 328 + 2 083)

(b) (3 476 + 2 328) + 2 083
(c) 2 328 + (2 083 + 3 476)
(d) 2 083 + (3 476 + 2 328)

7. Now do the calculations to check your answer for question 6.

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