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Maths tricks trick 22: Last-digit detective · Set 610 · 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 68 × 20 = 1360 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 35 × 87 = 3037 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 762 + 355 = 1117 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 78 × 63 = 4914 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 775 + 361 = 1141 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 22 × 24 = 522 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 35 × 64 = 2240 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 72 × 37 = 2669 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 66 × 57 = 3756 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 76 × 54 = 4104 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 826 + 208 = 1034 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 77 × 38 = 2922 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 18 × 77 = 1377 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 12 × 31 = 372 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 79 × 59 = 4661 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 200 + 495 = 702 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 192 + 761 = 953 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 780 + 930 = 1710 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 278 + 581 = 856 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 19 × 23 = 437 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 64 × 29 = 1857 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 235 + 377 = 612 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 639 + 269 = 908 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 29 × 98 = 2850 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 30 × 30 = 900 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 403 + 659 = 1062 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 71 × 83 = 5893 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 76 × 19 = 1444 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 28 × 17 = 467 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 368 + 926 = 1297 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 84 × 37 = 3108 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 839 + 171 = 1005 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 63 × 82 = 5163 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 418 + 892 = 1310 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 691 + 904 = 1595 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 35 × 53 = 1855 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 48 × 84 = 4032 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 871 + 589 = 1467 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 606 + 927 = 1533 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 117 + 319 = 436 right or wrong? (a) Wrong (b) Right

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