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L.O. To solve calculations by working backwards
1) 8613 + 1378 = 9991
2) 7982 + 4549 = 12531
3) 58.79 + 32.513 = 91.303
4) 5217 - 3504 = 1713
5) 87.29 - 21.34 = 65.95
6) 2148 x 6 = 12 888
7) 1379 x 7 = 9653
8) 326 x 14 = 4564
9) 227 x 25 = 5675
10) 8154 ÷ 6 = 1359
11) a) 85 b) 70
12) 29
13) Any numbers with a difference of 13 e.g. 1 and 14, 2 and 15 etc.
14) 76
15) 80 (1/2 + 1/4 = 3/4 3/4 = 60 1/4 = 20 4/4 = 80)
16) 124
17) 15