Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 179 · 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 480 + 366 = 846 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 41 × 74 = 3036 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 25 × 52 = 1300 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 45 × 24 = 1080 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 19 × 44 = 836 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 831 + 219 = 1047 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 80 × 76 = 6082 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 302 + 808 = 1110 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 58 × 78 = 4524 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 80 × 97 = 7760 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 753 + 268 = 1021 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 96 × 84 = 8062 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 108 + 107 = 212 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 245 + 226 = 471 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 63 × 91 = 5733 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 86 × 18 = 1539 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 20 × 85 = 1702 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 49 × 54 = 2646 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 188 + 289 = 477 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 432 + 418 = 841 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 28 × 44 = 1231 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 367 + 788 = 1157 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 494 + 481 = 975 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 18 × 51 = 918 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 41 × 55 = 2253 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 528 + 150 = 678 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 491 + 700 = 1189 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 58 × 58 = 3364 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 422 + 393 = 814 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 39 × 26 = 1009 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 94 × 22 = 2061 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 368 + 119 = 487 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 24 = 888 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 789 + 188 = 968 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 96 × 26 = 2496 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 292 + 616 = 908 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 91 × 21 = 1911 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 62 × 86 = 5332 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 525 + 110 = 635 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 86 × 71 = 6104 right or wrong? (a) Right (b) Wrong

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