Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 97 · 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 316 + 114 = 424 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 46 × 23 = 1058 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 59 × 65 = 3843 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 13 × 76 = 987 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 30 × 19 = 570 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 68 × 51 = 3474 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 127 + 388 = 515 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 868 + 120 = 996 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 96 × 36 = 3456 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 176 + 279 = 455 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 925 + 469 = 1391 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 294 + 822 = 1114 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 446 + 682 = 1125 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 94 × 32 = 3000 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 83 × 90 = 7462 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 56 × 74 = 4144 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 26 × 22 = 572 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 77 × 66 = 5082 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 84 × 12 = 1008 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 90 × 63 = 5670 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 41 × 87 = 3567 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 32 × 85 = 2720 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 113 + 304 = 417 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 40 × 40 = 1600 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 28 × 91 = 2548 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 82 × 37 = 3034 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 82 × 45 = 3698 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 37 × 85 = 3145 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 65 × 73 = 4745 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 32 × 33 = 1056 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 213 + 989 = 1210 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 177 + 718 = 895 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 738 + 470 = 1208 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 98 × 15 = 1470 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 208 + 629 = 839 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 462 + 791 = 1255 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 71 × 83 = 5897 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 53 × 45 = 2385 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 36 × 85 = 3060 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 480 + 901 = 1385 right or wrong? (a) Right (b) Wrong

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