Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 441 · 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 243 + 338 = 589 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 56 = 897 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 581 + 516 = 1097 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 297 + 604 = 901 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 14 × 89 = 1246 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 33 × 48 = 1592 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 523 + 779 = 1309 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 532 + 518 = 1050 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 67 × 59 = 3955 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 24 × 47 = 1124 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 33 × 77 = 2541 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 944 + 932 = 1875 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 76 × 36 = 2744 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 36 × 77 = 2772 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 252 + 137 = 386 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 20 × 24 = 480 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 520 + 365 = 885 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 545 + 287 = 832 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 86 × 16 = 1376 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 34 × 71 = 2423 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 378 + 698 = 1072 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 393 + 620 = 1013 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 300 + 586 = 886 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 987 + 123 = 1110 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 15 × 36 = 540 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 915 + 274 = 1189 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 218 + 274 = 498 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 445 + 120 = 562 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 89 × 89 = 7915 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 280 + 404 = 686 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 816 + 649 = 1465 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 91 × 79 = 7189 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 19 × 79 = 1501 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 83 × 66 = 5478 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 31 × 82 = 2539 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 945 + 914 = 1864 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 75 × 27 = 2025 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 924 + 296 = 1222 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 57 × 26 = 1482 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 69 × 17 = 1173 right or wrong? (a) Right (b) Wrong

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