Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 230 · 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 596 + 439 = 1043 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 58 × 16 = 929 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 999 + 392 = 1391 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 393 + 871 = 1264 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 23 = 1190 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 85 × 72 = 6120 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 268 + 741 = 1009 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 218 + 488 = 703 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 386 + 989 = 1380 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 798 + 579 = 1377 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 945 + 897 = 1842 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 43 × 22 = 940 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 86 × 82 = 7052 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 23 × 57 = 1311 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 79 × 36 = 2845 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 618 + 141 = 759 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 561 + 139 = 709 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 647 + 562 = 1209 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 816 + 170 = 989 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 55 × 62 = 3410 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 227 + 858 = 1091 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 87 × 56 = 4872 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 749 + 628 = 1378 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 199 + 246 = 442 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 596 + 258 = 846 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 166 + 847 = 1013 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 47 × 59 = 2768 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 60 × 67 = 4015 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 89 × 89 = 7921 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 17 × 64 = 1080 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 64 × 75 = 4803 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 796 + 655 = 1452 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 59 × 59 = 3481 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 335 + 549 = 884 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 83 × 95 = 7885 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 83 × 80 = 6631 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 239 + 858 = 1095 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 108 + 564 = 672 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 78 × 58 = 4528 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 885 + 468 = 1353 right or wrong? (a) Wrong (b) Right

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