Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 624 · 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 45 × 26 = 1167 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 99 × 26 = 2574 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 707 + 955 = 1662 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 99 × 76 = 7531 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 82 × 50 = 4100 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 48 × 74 = 3551 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 15 = 1110 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 475 + 932 = 1408 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 204 + 322 = 535 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 419 + 280 = 703 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 63 × 31 = 1953 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 62 × 63 = 3906 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 66 × 37 = 2442 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 58 = 1329 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 86 × 82 = 7052 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 476 + 315 = 791 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 72 = 1080 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 211 + 288 = 499 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 541 + 847 = 1385 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 38 × 41 = 1550 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 70 × 14 = 980 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 92 × 74 = 6814 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 72 × 89 = 6408 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 28 × 92 = 2576 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 198 + 837 = 1031 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 52 × 46 = 2383 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 416 + 397 = 813 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 22 × 84 = 1848 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 641 + 384 = 1018 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 751 + 377 = 1128 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 147 + 321 = 464 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 290 + 636 = 934 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 31 = 1078 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 32 × 22 = 704 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 154 + 432 = 584 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 167 + 287 = 457 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 471 + 828 = 1299 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 905 + 117 = 1022 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 26 × 76 = 1976 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 207 + 847 = 1054 right or wrong? (a) Wrong (b) Right

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