Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 410 · 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 55 × 17 = 935 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 769 + 562 = 1331 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 950 + 243 = 1198 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 454 + 284 = 738 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 689 + 574 = 1269 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 217 + 686 = 905 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 56 × 22 = 1232 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 38 × 17 = 646 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 90 × 28 = 2520 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 74 × 97 = 7180 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 92 × 93 = 8556 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 63 × 24 = 1512 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 97 × 88 = 8536 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 86 × 90 = 7733 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 173 + 276 = 448 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 651 + 935 = 1586 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 573 + 293 = 866 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 637 + 994 = 1633 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 33 × 80 = 2649 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 980 + 244 = 1228 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 69 × 73 = 5042 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 289 + 741 = 1030 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 89 × 27 = 2403 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 240 + 126 = 366 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 431 + 134 = 558 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 583 + 592 = 1175 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 309 + 189 = 502 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 92 × 59 = 5428 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 48 × 14 = 678 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 65 × 98 = 6370 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 21 × 84 = 1764 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 281 + 399 = 680 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 869 + 602 = 1471 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 821 + 132 = 953 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 73 × 34 = 2482 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 549 + 662 = 1220 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 794 + 315 = 1109 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 46 × 63 = 2898 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 694 + 977 = 1679 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 66 × 26 = 1716 right or wrong? (a) Right (b) Wrong

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