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Maths tricks trick 22: Last-digit detective · Set 794 · 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 13 × 12 = 154 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 26 × 99 = 2574 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 78 × 32 = 2494 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 348 + 810 = 1167 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 57 × 43 = 2442 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 17 × 94 = 1593 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 597 + 500 = 1094 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 94 = 5542 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 86 × 69 = 5933 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 796 + 645 = 1441 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 91 × 28 = 2548 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 190 + 431 = 621 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 96 × 84 = 8061 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 269 + 410 = 679 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 37 = 629 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 79 × 52 = 4114 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 459 + 116 = 583 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 62 × 30 = 1854 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 416 + 105 = 521 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 58 × 45 = 2607 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 813 + 182 = 995 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 814 + 441 = 1255 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 53 × 18 = 954 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 663 + 201 = 858 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 763 + 904 = 1658 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 393 + 133 = 526 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 614 + 914 = 1528 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 52 × 26 = 1352 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 908 + 745 = 1659 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 68 × 94 = 6389 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 40 × 47 = 1878 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 556 + 838 = 1385 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 322 + 453 = 775 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 13 × 94 = 1231 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 759 + 631 = 1390 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 530 + 965 = 1495 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 36 × 19 = 684 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 35 × 42 = 1470 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 858 + 351 = 1206 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 76 × 33 = 2504 right or wrong? (a) Wrong (b) Right

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