Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 690 · 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 324 + 270 = 594 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 12 × 87 = 1044 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 121 + 521 = 637 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 16 × 36 = 579 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 26 × 19 = 494 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 53 × 94 = 4987 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 17 × 91 = 1547 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 90 = 1262 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 907 + 339 = 1246 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 582 + 618 = 1200 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 883 + 264 = 1147 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 93 × 27 = 2511 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 218 + 333 = 551 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 99 × 15 = 1482 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 657 + 260 = 919 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 956 + 739 = 1695 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 53 × 60 = 3176 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 45 × 31 = 1395 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 501 + 224 = 725 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 58 × 13 = 754 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 66 × 84 = 5540 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 77 × 67 = 5159 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 74 = 2223 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 64 × 49 = 3136 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 157 + 213 = 364 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 307 + 293 = 605 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 346 + 463 = 800 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 588 + 722 = 1310 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 20 × 51 = 1020 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 27 × 80 = 2160 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 872 + 651 = 1514 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 767 + 654 = 1421 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 267 + 459 = 726 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 61 × 83 = 5065 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 91 × 64 = 5824 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 190 + 799 = 989 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 72 × 67 = 4820 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 18 × 13 = 234 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 28 × 17 = 476 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 834 + 896 = 1730 right or wrong? (a) Right (b) Wrong

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