Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 581 · 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 67 × 21 = 1407 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 99 × 96 = 9502 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 82 × 89 = 7297 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 339 + 541 = 880 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 46 × 89 = 4089 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 662 + 401 = 1063 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 18 × 73 = 1314 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 302 + 286 = 588 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 472 + 576 = 1048 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 37 × 94 = 3487 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 355 + 307 = 667 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 36 × 18 = 657 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 413 + 727 = 1146 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 420 + 502 = 922 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 53 × 74 = 3922 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 571 + 250 = 821 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 44 × 35 = 1549 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 54 × 29 = 1566 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 50 × 62 = 3102 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 520 + 635 = 1158 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 487 + 692 = 1179 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 701 + 306 = 1007 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 42 × 35 = 1470 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 18 × 75 = 1350 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 97 × 64 = 6208 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 21 × 31 = 650 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 612 + 792 = 1404 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 996 + 478 = 1474 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 33 × 97 = 3194 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 445 + 489 = 927 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 259 + 201 = 460 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 189 + 965 = 1148 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 786 + 106 = 892 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 431 + 178 = 609 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 62 × 35 = 2177 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 497 + 281 = 769 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 95 × 51 = 4845 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 698 + 172 = 872 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 300 + 293 = 593 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 46 × 34 = 1558 right or wrong? (a) Right (b) Wrong

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