Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 535 · 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 67 × 50 = 3350 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 875 + 666 = 1541 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 69 × 82 = 5660 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 152 + 724 = 876 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 43 = 2236 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 424 + 752 = 1176 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 83 × 68 = 5644 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 470 + 816 = 1280 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 576 + 137 = 713 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 59 × 87 = 5136 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 629 + 960 = 1588 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 347 + 164 = 511 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 633 + 670 = 1306 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 106 + 639 = 745 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 64 × 19 = 1207 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 279 + 522 = 801 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 20 × 49 = 975 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 950 + 846 = 1796 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 31 × 82 = 2542 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 209 + 560 = 773 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 155 + 129 = 284 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 31 × 35 = 1077 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 48 × 56 = 2690 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 99 × 35 = 3465 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 698 + 898 = 1596 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 18 × 27 = 486 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 54 × 86 = 4644 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 221 + 441 = 662 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 54 × 69 = 3726 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 748 + 985 = 1734 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 19 × 20 = 380 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 82 × 40 = 3280 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 57 × 95 = 5415 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 449 + 300 = 749 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 43 = 4002 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 124 + 502 = 624 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 316 + 242 = 552 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 794 + 299 = 1093 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 71 × 76 = 5388 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 57 × 12 = 684 right or wrong? (a) Wrong (b) Right

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