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Maths tricks trick 22: Last-digit detective · Set 85 · 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 42 × 96 = 4032 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 29 × 99 = 2871 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 21 × 67 = 1407 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 749 + 468 = 1217 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 632 + 831 = 1463 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 64 × 79 = 5054 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 145 + 447 = 593 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 67 × 82 = 5494 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 107 + 887 = 995 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 786 + 853 = 1639 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 177 + 779 = 956 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 20 × 91 = 1823 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 889 + 663 = 1552 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 13 × 83 = 1072 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 12 × 80 = 960 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 18 × 85 = 1530 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 994 + 128 = 1114 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 216 + 193 = 413 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 50 × 86 = 4296 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 41 × 67 = 2747 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 51 × 64 = 3264 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 388 + 735 = 1123 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 14 × 24 = 341 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 739 + 860 = 1599 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 77 × 99 = 7630 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 875 + 561 = 1436 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 74 × 90 = 6661 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 38 × 62 = 2351 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 66 × 54 = 3566 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 158 + 202 = 352 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 790 + 196 = 986 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 89 × 54 = 4806 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 24 × 45 = 1086 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 118 + 961 = 1079 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 29 × 74 = 2146 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 43 × 88 = 3783 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 802 + 904 = 1706 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 721 + 823 = 1538 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 53 × 20 = 1058 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 324 + 359 = 690 right or wrong? (a) Right (b) Wrong

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