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Maths tricks trick 22: Last-digit detective · Set 286 · 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 728 + 429 = 1160 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 789 + 135 = 924 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 64 × 31 = 1977 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 97 × 16 = 1549 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 96 × 26 = 2496 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 442 + 830 = 1272 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 518 + 539 = 1054 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 800 + 804 = 1595 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 376 + 337 = 713 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 125 + 609 = 734 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 15 = 285 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 82 = 5570 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 18 = 1782 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 984 + 623 = 1607 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 685 + 108 = 793 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 47 × 47 = 2209 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 463 + 717 = 1172 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 37 × 38 = 1401 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 80 × 73 = 5837 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 434 + 267 = 708 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 314 + 897 = 1215 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 576 + 625 = 1201 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 30 × 34 = 1020 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 44 × 79 = 3476 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 332 + 424 = 756 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 294 + 854 = 1148 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 22 = 1562 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 468 + 447 = 924 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 199 + 716 = 922 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 767 + 322 = 1098 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 44 × 23 = 1012 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 108 + 202 = 318 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 37 × 20 = 740 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 200 + 303 = 503 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 89 × 70 = 6236 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 46 × 37 = 1711 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 143 + 220 = 363 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 30 × 75 = 2250 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 94 × 95 = 8930 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 82 × 44 = 3608 right or wrong? (a) Wrong (b) Right

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