Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 937 · 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 31 × 97 = 3016 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 146 + 597 = 743 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 960 + 217 = 1177 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 685 + 629 = 1314 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 130 + 367 = 497 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 345 + 935 = 1280 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 35 × 98 = 3429 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 43 × 95 = 4085 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 342 + 636 = 978 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 49 × 49 = 2401 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 50 × 64 = 3196 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 96 × 26 = 2487 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 135 + 862 = 997 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 67 × 23 = 1541 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 125 + 344 = 465 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 110 + 911 = 1018 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 85 = 5274 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 183 + 629 = 812 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 21 × 70 = 1475 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 27 × 82 = 2210 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 401 + 507 = 908 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 329 + 867 = 1196 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 551 + 490 = 1039 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 858 + 287 = 1145 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 519 + 503 = 1016 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 61 × 15 = 915 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 29 × 79 = 2288 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 78 × 34 = 2652 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 304 + 755 = 1059 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 17 × 28 = 481 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 155 + 744 = 899 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 43 × 41 = 1767 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 190 + 398 = 588 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 467 + 177 = 644 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 12 × 72 = 869 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 82 × 53 = 4346 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 671 + 393 = 1064 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 256 + 776 = 1041 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 299 + 815 = 1114 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 59 × 43 = 2537 right or wrong? (a) Wrong (b) Right

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