Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 76 · 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 369 + 986 = 1353 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 49 × 39 = 1911 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 508 + 801 = 1309 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 61 × 90 = 5484 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 552 + 935 = 1487 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 94 × 41 = 3856 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 85 × 90 = 7650 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 307 + 718 = 1030 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 929 + 571 = 1500 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 68 × 67 = 4557 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 501 + 860 = 1364 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 136 + 191 = 327 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 178 + 769 = 947 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 210 + 643 = 853 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 226 + 281 = 507 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 900 + 263 = 1163 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 53 × 23 = 1219 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 44 × 71 = 3124 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 948 + 713 = 1653 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 22 × 89 = 1958 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 939 + 571 = 1510 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 636 + 546 = 1182 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 108 + 293 = 401 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 282 + 496 = 787 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 89 × 96 = 8546 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 97 × 45 = 4369 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 710 + 717 = 1427 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 96 × 87 = 8352 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 658 + 919 = 1577 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 62 × 34 = 2101 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 879 + 326 = 1205 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 969 + 350 = 1319 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 68 = 1776 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 82 × 44 = 3612 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 460 + 398 = 852 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 92 × 18 = 1656 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 723 + 281 = 997 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 291 + 825 = 1116 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 20 × 81 = 1620 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 28 × 20 = 552 right or wrong? (a) Wrong (b) Right

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