Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 956 · 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 36 × 27 = 972 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 313 + 459 = 773 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 956 + 510 = 1460 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 505 + 828 = 1338 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 928 + 258 = 1186 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 86 × 84 = 7221 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 571 + 215 = 786 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 836 + 887 = 1723 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 87 × 67 = 5829 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 99 × 79 = 7821 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 237 + 766 = 1003 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 335 + 791 = 1121 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 356 + 499 = 860 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 43 × 15 = 645 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 983 + 796 = 1779 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 441 + 873 = 1314 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 24 × 47 = 1126 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 341 + 786 = 1131 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 45 = 2925 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 61 × 92 = 5612 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 221 + 418 = 636 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 55 × 48 = 2640 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 49 × 99 = 4856 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 707 + 133 = 841 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 42 × 90 = 3780 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 71 × 86 = 6106 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 849 + 683 = 1529 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 354 + 680 = 1034 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 728 + 963 = 1684 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 405 + 724 = 1131 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 93 × 25 = 2322 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 603 + 474 = 1077 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 106 + 783 = 884 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 54 × 95 = 5121 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 17 × 22 = 374 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 71 × 69 = 4899 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 21 = 602 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 291 + 223 = 514 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 21 × 16 = 336 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 367 + 789 = 1158 right or wrong? (a) Wrong (b) Right

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