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Maths tricks trick 22: Last-digit detective · Set 667 · 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 29 × 35 = 1011 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 90 × 19 = 1701 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 233 + 148 = 381 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 914 + 381 = 1295 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 973 + 947 = 1920 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 20 × 38 = 760 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 594 + 668 = 1262 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 912 + 872 = 1784 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 55 × 52 = 2860 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 93 × 77 = 7170 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 417 + 455 = 863 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 978 + 739 = 1717 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 27 × 62 = 1676 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 944 + 349 = 1285 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 13 × 96 = 1257 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 295 + 422 = 718 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 591 + 276 = 867 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 488 + 438 = 933 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 58 × 93 = 5394 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 93 × 15 = 1401 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 40 × 19 = 752 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 952 + 871 = 1817 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 87 × 39 = 3393 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 96 × 92 = 8832 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 599 + 271 = 864 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 46 × 62 = 2843 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 71 × 86 = 6103 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 27 × 56 = 1519 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 976 + 960 = 1933 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 559 + 597 = 1147 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 936 + 221 = 1165 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 350 + 602 = 952 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 894 + 249 = 1138 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 892 + 822 = 1716 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 86 × 28 = 2408 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 195 + 682 = 885 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 82 × 65 = 5330 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 69 × 33 = 2285 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 682 + 719 = 1410 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 743 + 302 = 1044 right or wrong? (a) Right (b) Wrong

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