Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 56 · 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 44 × 69 = 3036 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 74 × 53 = 3913 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 49 × 21 = 1026 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 77 × 84 = 6468 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 12 × 85 = 1020 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 29 × 43 = 1247 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 37 × 17 = 629 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 948 + 315 = 1263 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 187 + 890 = 1077 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 33 × 91 = 2995 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 81 × 22 = 1782 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 98 × 53 = 5197 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 28 × 34 = 952 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 557 + 329 = 886 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 826 + 800 = 1628 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 23 × 76 = 1740 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 634 + 119 = 753 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 691 + 799 = 1486 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 86 × 37 = 3191 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 85 × 98 = 8323 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 614 + 748 = 1365 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 29 × 58 = 1682 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 778 + 720 = 1502 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 88 × 65 = 5711 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 907 + 152 = 1050 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 26 × 18 = 468 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 857 + 536 = 1393 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 409 + 955 = 1364 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 12 × 96 = 1160 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 81 × 70 = 5665 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 36 × 30 = 1079 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 197 + 617 = 810 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 956 + 111 = 1072 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 76 × 55 = 4173 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 16 × 20 = 319 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 911 + 903 = 1822 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 31 × 42 = 1302 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 756 + 759 = 1515 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 201 + 819 = 1016 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 809 + 657 = 1473 right or wrong? (a) Right (b) Wrong

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