Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 886 · 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 800 + 108 = 907 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 51 × 26 = 1326 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 93 × 24 = 2231 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 48 × 43 = 2073 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 516 + 537 = 1053 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 988 + 181 = 1167 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 96 × 89 = 8550 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 93 × 86 = 7998 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 84 × 52 = 4368 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 78 = 1560 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 789 + 448 = 1238 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 256 + 367 = 623 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 92 = 2852 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 55 × 20 = 1093 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 986 + 489 = 1483 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 139 + 690 = 838 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 664 + 739 = 1403 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 79 × 76 = 5997 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 36 × 72 = 2591 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 22 × 48 = 1056 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 20 × 98 = 1960 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 594 + 421 = 1015 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 56 × 66 = 3700 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 34 × 17 = 583 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 41 × 23 = 943 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 231 + 190 = 418 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 28 × 45 = 1267 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 80 × 35 = 2794 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 18 × 69 = 1242 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 721 + 794 = 1514 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 231 + 898 = 1134 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 59 × 59 = 3478 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 705 + 379 = 1087 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 142 + 194 = 336 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 735 + 641 = 1376 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 73 × 87 = 6353 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 506 + 671 = 1177 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 617 + 331 = 949 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 72 × 82 = 5904 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 279 + 828 = 1107 right or wrong? (a) Wrong (b) Right

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