Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 340 · 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 48 × 15 = 720 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 546 + 140 = 686 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 20 = 724 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 13 × 17 = 217 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 939 + 358 = 1297 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 41 × 71 = 2911 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 63 × 37 = 2331 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 19 × 96 = 1824 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 947 + 726 = 1673 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 422 + 968 = 1390 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 56 × 29 = 1627 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 23 × 25 = 583 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 903 + 173 = 1080 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 106 + 566 = 672 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 228 + 544 = 768 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 363 + 268 = 634 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 51 × 18 = 918 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 32 × 74 = 2360 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 89 × 65 = 5785 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 55 × 22 = 1213 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 16 × 45 = 718 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 28 × 93 = 2596 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 315 + 719 = 1029 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 35 × 15 = 525 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 40 × 51 = 2049 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 30 × 46 = 1375 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 31 × 55 = 1699 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 948 + 230 = 1173 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 36 × 33 = 1196 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 231 + 646 = 886 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 236 + 438 = 674 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 375 + 112 = 487 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 20 × 87 = 1740 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 935 + 582 = 1511 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 52 × 16 = 832 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 68 × 63 = 4284 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 566 + 323 = 889 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 77 × 67 = 5159 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 73 × 74 = 5402 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 42 × 87 = 3649 right or wrong? (a) Wrong (b) Right

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