Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 95 · 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 23 × 33 = 759 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 18 × 68 = 1224 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 650 + 492 = 1147 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 425 + 659 = 1084 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 84 × 62 = 5208 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 17 × 42 = 714 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 467 + 149 = 616 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 58 = 2083 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 428 + 609 = 1033 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 82 × 22 = 1804 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 37 × 46 = 1705 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 76 × 62 = 4712 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 388 + 712 = 1094 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 974 + 713 = 1687 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 44 = 2244 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 774 + 136 = 913 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 156 + 875 = 1026 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 832 + 400 = 1232 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 46 × 72 = 3312 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 375 + 338 = 713 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 99 × 95 = 9411 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 889 + 339 = 1228 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 86 × 34 = 2924 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 26 × 22 = 571 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 412 + 613 = 1025 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 626 + 220 = 846 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 95 × 48 = 4563 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 36 × 53 = 1908 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 429 + 695 = 1115 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 82 × 32 = 2624 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 41 × 99 = 4059 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 85 × 39 = 3315 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 479 + 245 = 724 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 884 + 668 = 1551 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 518 + 209 = 733 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 70 × 24 = 1673 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 300 + 117 = 417 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 30 × 96 = 2880 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 890 + 874 = 1763 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 710 + 364 = 1074 right or wrong? (a) Right (b) Wrong

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