Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 117 · 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 33 × 41 = 1353 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 758 + 581 = 1339 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 56 × 45 = 2523 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 79 × 17 = 1345 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 806 + 656 = 1462 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 24 × 67 = 1608 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 80 × 85 = 6800 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 148 + 903 = 1051 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 204 + 123 = 324 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 418 + 108 = 524 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 97 × 57 = 5529 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 365 + 296 = 661 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 126 + 647 = 777 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 33 × 26 = 849 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 38 × 87 = 3300 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 78 × 91 = 7098 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 405 + 455 = 860 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 37 × 51 = 1887 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 42 × 57 = 2397 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 43 × 29 = 1242 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 19 × 48 = 912 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 157 + 891 = 1048 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 599 + 303 = 896 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 36 × 72 = 2584 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 365 + 184 = 553 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 136 + 500 = 628 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 218 + 292 = 517 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 90 × 17 = 1526 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 64 × 90 = 5760 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 28 × 93 = 2596 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 77 × 53 = 4081 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 450 + 216 = 660 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 42 × 62 = 2604 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 91 × 31 = 2830 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 69 × 42 = 2890 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 265 + 781 = 1047 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 920 + 379 = 1299 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 220 + 232 = 452 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 13 = 377 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 27 × 49 = 1317 right or wrong? (a) Wrong (b) Right

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