Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 349 · 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 189 + 737 = 926 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 425 + 778 = 1205 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 862 + 577 = 1436 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 83 × 17 = 1415 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 344 + 599 = 939 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 14 × 93 = 1303 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 588 + 560 = 1148 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 139 + 945 = 1084 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 960 + 794 = 1759 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 619 + 160 = 783 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 575 + 811 = 1392 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 20 × 93 = 1860 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 684 + 216 = 900 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 14 × 17 = 232 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 50 × 29 = 1450 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 765 + 642 = 1410 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 19 × 51 = 969 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 63 × 90 = 5663 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 444 + 275 = 719 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 648 + 255 = 902 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 86 × 49 = 4214 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 282 + 387 = 669 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 76 × 64 = 4864 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 965 + 540 = 1498 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 95 × 62 = 5890 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 165 + 991 = 1156 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 106 + 117 = 228 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 152 + 969 = 1121 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 55 × 53 = 2908 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 819 + 816 = 1635 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 986 + 552 = 1534 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 89 = 2839 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 209 + 905 = 1114 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 314 + 131 = 445 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 81 × 80 = 6480 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 90 × 96 = 8640 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 79 × 93 = 7347 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 27 × 79 = 2127 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 87 × 74 = 6438 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 76 × 35 = 2660 right or wrong? (a) Wrong (b) Right

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