Page 32 - Whole Numbers (Addition and Subtraction)

4. Add on the place value parts of the second number to
calculate the following:
(a) 4 628 + 2 775 (b) 4 775 + 2 628

5. Check your answers for question 3 by adding in the way you
just did in question 4.

6. When 3 465 + 4 574 is calculated, do you think it matters
which of 4 000, 500, 70 and 4 is added to 3 465 first and which
part is added next?

Complete these calculations to check your answer:
(a) 3 465 + 4 → . . . . + 70 → . . . . + 500 → . . . . + 4 000 = . . . .

(b) 3 465 + 70 → . . . . + 4 → . . . . + 4 000 → . . . . + 500 = . . . .

(c) 3 465 + 500 → . . . . + 4 000 → . . . . + 4 → . . . . + 70 = . . . .

In question 6(a) the instructions are to add 4 first, then 70, then
500 and then 4 000.
In question 6(c) the instructions are to add 500 first, then
4 000, then 4 and then 70.

7. Write like in question 6 to give the following instructions:

Calculate 3 465 + 4 574 by first adding 70, then 500, then 4 and
then 4 000.
8. (a) Calculate 5 374 + 2 824 by adding the second number in
parts. You can add the parts in any order you prefer.

(b) Calculate 5 374 + 2 824 again but now add the parts of the
second number in a different order.

(c) Calculate 6 785 − 3 241 by subtracting the place value
parts of 3 241 one by one.

(d) Calculate 6 785 − 3 241 by subtracting the place value
parts of 3 241 in a different order.

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