Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 288 · 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 44 × 66 = 2913 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 33 × 87 = 2871 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 712 + 366 = 1081 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 731 + 222 = 953 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 922 + 195 = 1124 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 26 × 18 = 468 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 52 = 1092 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 888 + 423 = 1317 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 64 × 71 = 4544 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 87 × 57 = 4959 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 95 × 87 = 8264 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 410 + 561 = 963 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 22 × 72 = 1584 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 85 × 80 = 6800 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 97 × 98 = 9506 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 550 + 418 = 961 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 76 × 33 = 2508 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 167 + 519 = 686 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 15 × 70 = 1050 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 45 × 83 = 3735 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 83 × 29 = 2406 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 235 + 460 = 695 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 166 + 564 = 730 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 97 × 62 = 6014 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 27 × 12 = 324 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 43 × 82 = 3528 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 242 + 983 = 1225 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 202 + 923 = 1125 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 13 × 73 = 943 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 793 + 892 = 1685 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 51 × 43 = 2193 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 93 × 55 = 5111 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 97 × 84 = 8151 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 97 × 85 = 8245 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 291 + 126 = 421 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 850 + 858 = 1714 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 351 + 924 = 1269 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 265 + 199 = 464 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 48 × 64 = 3072 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 761 + 839 = 1595 right or wrong? (a) Wrong (b) Right

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