Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 524 · 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 127 + 725 = 857 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 34 × 18 = 611 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 64 × 65 = 4167 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 30 × 38 = 1145 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 45 × 72 = 3242 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 991 + 346 = 1337 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 920 + 778 = 1689 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 86 = 3096 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 109 + 128 = 237 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 713 + 489 = 1203 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 602 + 763 = 1370 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 19 × 29 = 551 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 234 + 298 = 525 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 84 × 61 = 5121 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 30 × 59 = 1770 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 81 × 70 = 5670 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 50 × 71 = 3554 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 713 + 875 = 1583 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 32 × 34 = 1088 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 279 + 192 = 471 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 24 × 48 = 1154 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 42 × 35 = 1470 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 875 + 126 = 1001 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 865 + 112 = 978 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 45 = 2385 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 86 × 85 = 7310 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 601 + 559 = 1160 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 32 × 90 = 2880 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 338 + 919 = 1257 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 60 × 13 = 776 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 94 × 17 = 1598 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 12 × 17 = 204 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 57 × 95 = 5410 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 26 × 66 = 1716 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 289 + 685 = 974 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 788 + 399 = 1189 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 77 × 14 = 1083 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 44 × 61 = 2680 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 638 + 287 = 925 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 17 × 34 = 576 right or wrong? (a) Right (b) Wrong

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