Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 588 · 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 230 + 534 = 763 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 976 + 193 = 1176 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 376 + 782 = 1158 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 244 + 428 = 672 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 15 × 28 = 418 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 389 + 263 = 656 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 13 × 47 = 611 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 40 × 77 = 3080 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 309 + 275 = 582 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 12 × 19 = 228 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 68 × 40 = 2724 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 364 + 750 = 1123 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 18 × 66 = 1188 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 14 × 71 = 994 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 783 + 307 = 1090 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 80 × 93 = 7443 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 259 + 507 = 766 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 99 × 72 = 7134 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 98 × 13 = 1274 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 38 × 95 = 3615 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 53 × 71 = 3765 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 520 + 144 = 664 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 34 × 41 = 1402 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 63 × 96 = 6057 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 85 × 95 = 8080 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 172 + 484 = 655 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 88 × 82 = 7217 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 35 × 33 = 1155 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 374 + 966 = 1337 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 31 × 41 = 1271 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 77 × 43 = 3311 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 365 + 207 = 572 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 94 × 16 = 1502 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 15 × 82 = 1221 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 935 + 536 = 1464 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 68 × 48 = 3257 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 796 + 443 = 1239 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 61 × 29 = 1769 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 23 × 16 = 368 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 538 + 293 = 822 right or wrong? (a) Wrong (b) Right

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