Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 94 · 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 98 × 70 = 6857 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 739 + 181 = 913 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 232 + 375 = 607 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 456 + 867 = 1323 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 16 × 86 = 1384 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 59 × 49 = 2891 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 757 + 289 = 1046 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 26 × 64 = 1663 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 22 × 56 = 1231 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 31 × 83 = 2573 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 30 × 69 = 2076 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 89 × 87 = 7734 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 584 + 493 = 1079 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 552 + 535 = 1087 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 791 + 914 = 1702 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 17 = 778 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 26 × 92 = 2392 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 319 + 736 = 1055 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 93 × 61 = 5680 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 404 + 380 = 781 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 718 + 921 = 1632 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 346 + 524 = 870 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 96 × 29 = 2787 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 54 × 70 = 3785 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 56 × 75 = 4197 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 46 × 89 = 4087 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 24 × 94 = 2256 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 20 × 63 = 1260 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 67 × 61 = 4095 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 66 × 70 = 4626 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 26 × 89 = 2314 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 494 + 164 = 658 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 70 × 64 = 4481 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 978 + 496 = 1474 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 37 × 85 = 3151 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 555 + 912 = 1467 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 17 = 500 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 595 + 287 = 877 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 38 × 80 = 3048 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 83 × 47 = 3904 right or wrong? (a) Wrong (b) Right

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