Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 917 · 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 455 + 428 = 891 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 84 × 38 = 3194 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 68 × 31 = 2114 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 89 × 51 = 4537 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 89 × 51 = 4546 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 354 + 236 = 593 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 621 + 863 = 1484 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 114 + 111 = 225 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 99 × 33 = 3274 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 33 × 24 = 797 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 222 + 622 = 844 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 47 × 79 = 3717 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 880 + 309 = 1195 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 32 × 24 = 768 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 232 + 698 = 926 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 969 + 475 = 1444 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 16 × 33 = 528 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 920 + 489 = 1411 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 643 + 959 = 1593 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 89 × 27 = 2403 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 81 × 58 = 4695 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 46 × 76 = 3496 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 56 = 4640 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 98 × 38 = 3717 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 416 + 164 = 580 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 13 × 20 = 263 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 348 + 576 = 924 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 39 × 13 = 514 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 58 × 29 = 1680 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 87 × 21 = 1827 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 535 + 759 = 1286 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 82 × 79 = 6478 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 274 + 467 = 732 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 954 + 427 = 1381 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 30 × 17 = 518 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 76 × 37 = 2811 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 76 × 27 = 2055 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 363 + 223 = 586 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 870 + 212 = 1079 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 48 × 31 = 1482 right or wrong? (a) Wrong (b) Right

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