Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 645 · 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 63 × 55 = 3464 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 719 + 548 = 1267 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 53 × 39 = 2067 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 47 × 20 = 940 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 51 × 84 = 4284 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 505 + 960 = 1473 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 452 + 219 = 673 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 32 × 31 = 992 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 25 × 48 = 1200 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 63 × 62 = 3906 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 40 × 12 = 489 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 48 × 83 = 3978 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 54 × 24 = 1296 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 28 × 60 = 1680 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 586 + 250 = 836 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 856 + 375 = 1231 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 40 × 90 = 3593 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 68 × 82 = 5576 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 28 × 90 = 2520 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 56 × 31 = 1736 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 93 × 43 = 3999 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 164 + 613 = 777 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 557 + 468 = 1025 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 912 + 919 = 1822 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 32 × 50 = 1597 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 25 × 93 = 2325 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 78 × 45 = 3510 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 77 × 86 = 6622 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 848 + 943 = 1791 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 26 × 58 = 1508 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 615 + 196 = 811 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 82 × 71 = 5822 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 28 × 60 = 1685 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 16 × 32 = 514 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 465 + 128 = 601 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 780 + 549 = 1337 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 672 + 774 = 1451 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 680 + 517 = 1197 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 63 × 36 = 2268 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 990 + 563 = 1553 right or wrong? (a) Wrong (b) Right

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