Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 366 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 26 × 21 = 537 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 209 + 776 = 985 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 40 × 65 = 2603 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 860 + 433 = 1293 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 27 × 73 = 1971 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 32 × 71 = 2269 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 66 × 95 = 6275 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 565 + 170 = 727 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 481 + 783 = 1264 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 33 = 653 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 944 + 137 = 1089 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 542 + 510 = 1052 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 784 + 868 = 1649 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 353 + 781 = 1134 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 32 × 79 = 2527 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 94 × 34 = 3199 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 806 + 836 = 1649 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 56 × 16 = 896 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 53 × 99 = 5243 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 82 × 62 = 5085 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 88 × 70 = 6167 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 87 × 92 = 8004 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 70 × 19 = 1322 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 407 + 836 = 1252 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 14 × 32 = 445 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 16 × 85 = 1360 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 530 + 153 = 675 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 438 + 298 = 736 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 25 × 48 = 1194 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 21 × 23 = 483 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 35 × 51 = 1777 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 345 + 445 = 787 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 684 + 119 = 802 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 754 + 139 = 893 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 194 + 917 = 1111 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 57 × 84 = 4792 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 615 + 905 = 1520 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 46 × 21 = 963 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 876 + 661 = 1533 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 928 + 261 = 1189 right or wrong? (a) Right (b) Wrong

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