Page 12 - Whole Numbers (Addition and Subtraction)

You can also add to numbers in facts that you know, to make
new facts about multiples of ten and hundred:

30 + 50 = 80 300 + 300 = 600
+10 +10 + 200 + 200

40 + 50 = 90 300 + 500 = 800

5. (a) Make five other facts from 20 + 30 = 50.

(b) Make five other facts from 200 + 300 = 500.
(c) Make five other facts from 300 + 400 = 700.

6. Copy the number sentences for which you cannot find the
answers quickly.

(a) 80 + 90 = . . . (b) 80 + 80 = . . . (c) 80 + 60 = . . .
(d) 80 + 10 = . . . (e) 80 + 40 = . . . (f) 80 + 30 = . . .
(g) 10 + 30 = . . . (h) 30 + 80 = . . . (i) 30 + 70 = . . .
(j) 30 + 90 = . . . (k) 30 + 30 = . . . (l) 30 + 60 = . . .
(m) 30 + 10 = . . . (n) 30 + 40 = . . . (o) 30 + 50 = . . .

7. Now complete the number sentences that you have copied in
question 6. You may work from the facts that you know, or fill
up to hundreds, or work in any other way you prefer.

8. Copy the number sentences for which you cannot find the
answers quickly.

(a) 100 + 700 = . . . (b) 700 + 200 = . . .
(c) 900 + 100 = . . . (d) 300 + 700 = . . .
(e) 800 + 900 = . . . (f) 600 + 400 = . . .
(g) 100 + 400 = . . . (h) 400 + 300 = . . .
(i) 400 + 200 = . . . (j) 200 + 300 = . . .

9. Now complete the sentences that you copied in question 8.
You may work from the facts that you know, or work in any
other way you prefer.

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