Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 686 · 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 61 × 81 = 4935 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 659 + 853 = 1512 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 435 + 849 = 1284 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 58 × 88 = 5104 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 155 + 849 = 1004 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 48 × 65 = 3128 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 525 + 703 = 1228 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 22 × 65 = 1436 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 640 + 504 = 1142 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 546 + 713 = 1263 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 67 × 37 = 2479 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 931 + 671 = 1599 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 426 + 994 = 1422 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 432 + 765 = 1206 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 65 × 82 = 5338 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 21 × 22 = 457 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 37 × 30 = 1108 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 390 + 314 = 695 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 56 × 13 = 731 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 88 × 61 = 5367 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 226 + 410 = 627 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 87 × 23 = 2001 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 68 × 42 = 2856 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 17 × 76 = 1292 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 20 × 32 = 643 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 17 × 67 = 1139 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 825 + 581 = 1406 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 39 × 30 = 1170 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 15 × 41 = 608 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 17 × 42 = 714 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 43 × 28 = 1204 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 334 + 732 = 1066 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 513 + 394 = 907 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 30 × 54 = 1620 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 55 × 80 = 4400 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 18 × 68 = 1224 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 139 + 540 = 679 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 18 = 225 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 33 × 49 = 1624 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 81 × 22 = 1789 right or wrong? (a) Right (b) Wrong

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