Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 8 · 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 19 × 17 = 323 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 48 × 31 = 1488 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 443 + 466 = 907 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 108 + 463 = 568 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 511 + 200 = 711 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 40 × 29 = 1160 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 129 + 410 = 539 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 192 + 975 = 1164 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 78 × 77 = 6002 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 365 + 268 = 633 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 65 × 57 = 3705 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 979 + 501 = 1480 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 142 + 141 = 283 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 862 + 559 = 1429 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 85 × 37 = 3145 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 45 × 59 = 2655 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 34 × 23 = 782 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 48 × 26 = 1248 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 405 + 760 = 1165 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 629 + 935 = 1561 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 895 + 741 = 1627 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 368 + 869 = 1237 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 14 × 97 = 1358 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 25 = 1450 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 109 + 791 = 896 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 503 + 656 = 1167 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 30 × 94 = 2829 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 826 + 723 = 1554 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 76 × 63 = 4791 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 32 × 83 = 2656 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 307 + 206 = 518 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 14 × 78 = 1092 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 242 + 883 = 1125 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 26 × 63 = 1638 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 938 + 338 = 1277 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 274 + 456 = 730 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 30 × 14 = 420 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 938 + 987 = 1920 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 18 × 94 = 1692 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 76 × 55 = 4181 right or wrong? (a) Right (b) Wrong

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