Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 946 · 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 354 + 549 = 908 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 49 × 57 = 2801 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 844 + 391 = 1235 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 782 + 980 = 1762 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 30 × 37 = 1110 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 13 = 247 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 278 + 625 = 908 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 79 × 57 = 4504 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 627 + 309 = 934 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 493 + 789 = 1282 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 27 × 79 = 2142 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 32 = 512 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 542 + 939 = 1474 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 69 × 97 = 6693 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 38 × 13 = 494 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 785 + 900 = 1685 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 396 + 563 = 964 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 43 × 55 = 2368 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 66 × 26 = 1724 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 603 + 660 = 1269 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 78 × 21 = 1630 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 53 × 77 = 4077 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 496 + 627 = 1127 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 42 × 89 = 3738 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 728 + 910 = 1634 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 20 × 13 = 260 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 90 = 6389 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 133 + 712 = 850 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 37 = 1480 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 13 × 98 = 1274 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 984 + 524 = 1508 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 75 × 21 = 1575 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 446 + 994 = 1440 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 759 + 728 = 1489 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 70 × 29 = 2026 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 33 × 73 = 2409 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 31 × 73 = 2271 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 20 × 34 = 680 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 35 × 14 = 490 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 67 × 52 = 3489 right or wrong? (a) Right (b) Wrong

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