Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 279 · 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 462 + 896 = 1366 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 674 + 276 = 951 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 64 × 69 = 4418 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 789 + 398 = 1187 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 363 + 468 = 831 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 18 × 24 = 441 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 301 + 247 = 555 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 12 × 39 = 459 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 51 × 68 = 3472 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 89 = 1958 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 80 = 7767 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 481 + 134 = 609 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 81 × 66 = 5346 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 85 = 3740 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 65 × 25 = 1620 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 88 × 45 = 3960 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 597 + 153 = 744 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 163 + 918 = 1084 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 21 × 88 = 1857 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 83 × 93 = 7719 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 84 × 13 = 1092 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 697 + 153 = 844 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 59 × 50 = 2952 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 506 + 835 = 1340 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 520 + 590 = 1112 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 530 + 218 = 754 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 98 × 25 = 2446 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 593 + 989 = 1582 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 98 × 87 = 8535 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 840 + 242 = 1082 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 110 + 203 = 306 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 97 × 12 = 1167 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 78 = 1558 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 612 + 849 = 1466 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 393 + 427 = 820 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 771 + 274 = 1044 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 38 × 29 = 1105 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 796 + 755 = 1551 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 53 × 72 = 3816 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 89 × 51 = 4538 right or wrong? (a) Wrong (b) Right

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