Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 207 · 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 72 × 51 = 3672 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 293 + 434 = 727 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 84 × 45 = 3780 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 93 = 3256 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 560 + 679 = 1239 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 250 + 136 = 382 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 702 + 333 = 1035 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 93 × 58 = 5394 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 60 × 28 = 1680 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 868 + 874 = 1735 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 694 + 131 = 830 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 85 × 95 = 8075 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 15 × 29 = 435 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 59 × 17 = 1001 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 41 × 61 = 2495 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 96 × 36 = 3464 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 46 × 64 = 2944 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 79 × 73 = 5767 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 64 × 36 = 2304 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 18 × 56 = 1007 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 92 × 15 = 1382 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 78 × 24 = 1872 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 76 × 98 = 7448 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 56 × 74 = 4152 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 87 × 52 = 4521 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 600 + 112 = 717 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 726 + 707 = 1434 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 368 + 638 = 1006 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 77 × 30 = 2306 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 732 + 297 = 1029 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 499 + 918 = 1424 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 21 × 39 = 819 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 22 = 819 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 945 + 780 = 1725 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 237 + 134 = 362 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 91 × 38 = 3458 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 25 × 22 = 543 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 61 × 77 = 4697 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 35 × 83 = 2905 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 395 + 171 = 566 right or wrong? (a) Right (b) Wrong

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