Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 101 · 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 67 × 23 = 1541 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 92 = 5152 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 50 × 36 = 1808 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 22 × 51 = 1121 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 457 + 963 = 1427 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 27 × 48 = 1296 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 432 + 559 = 995 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 36 = 900 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 382 + 213 = 595 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 29 × 93 = 2704 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 975 + 430 = 1405 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 23 × 87 = 2001 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 86 × 33 = 2838 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 911 + 256 = 1167 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 31 × 97 = 3007 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 707 + 511 = 1218 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 419 + 324 = 743 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 63 × 97 = 6107 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 409 + 721 = 1130 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 584 + 242 = 833 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 167 + 248 = 415 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 85 × 43 = 3655 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 34 × 36 = 1215 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 878 + 788 = 1666 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 775 + 681 = 1456 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 68 × 72 = 4904 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 950 + 279 = 1229 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 274 + 157 = 432 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 328 + 820 = 1148 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 52 × 29 = 1508 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 117 + 787 = 903 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 83 × 19 = 1579 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 373 + 908 = 1282 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 90 × 42 = 3781 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 91 × 79 = 7198 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 839 + 896 = 1728 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 52 × 35 = 1820 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 904 + 448 = 1349 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 639 + 766 = 1405 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 47 × 90 = 4230 right or wrong? (a) Wrong (b) Right

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