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Maths tricks trick 22: Last-digit detective · Set 297 · 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 27 × 90 = 2425 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 116 + 183 = 299 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 466 + 574 = 1045 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 17 = 1369 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 516 + 179 = 700 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 612 + 765 = 1377 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 75 × 96 = 7207 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 566 + 508 = 1074 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 81 × 58 = 4698 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 767 + 851 = 1618 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 939 + 491 = 1430 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 22 × 32 = 696 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 358 + 154 = 512 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 623 + 255 = 878 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 621 + 548 = 1169 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 992 + 335 = 1321 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 439 + 160 = 594 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 798 + 438 = 1236 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 57 × 66 = 3762 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 26 × 72 = 1872 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 292 + 334 = 630 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 536 + 601 = 1137 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 621 + 204 = 825 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 127 + 759 = 885 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 43 × 22 = 952 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 939 + 644 = 1583 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 13 × 31 = 403 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 95 × 76 = 7220 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 687 + 932 = 1619 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 66 × 63 = 4158 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 825 + 861 = 1691 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 12 × 80 = 961 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 36 × 36 = 1296 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 679 + 775 = 1447 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 678 + 264 = 942 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 89 × 76 = 6764 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 686 + 252 = 938 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 744 + 305 = 1049 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 43 × 78 = 3352 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 915 + 998 = 1904 right or wrong? (a) Wrong (b) Right

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