Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 480 · 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 41 × 98 = 4017 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 544 + 760 = 1304 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 69 = 2484 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 260 + 908 = 1168 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 52 × 51 = 2656 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 239 + 578 = 817 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 835 + 183 = 1019 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 66 × 28 = 1840 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 74 × 24 = 1776 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 91 × 66 = 6010 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 26 × 29 = 754 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 698 + 138 = 831 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 929 + 572 = 1492 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 450 + 696 = 1146 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 399 + 664 = 1054 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 554 + 975 = 1529 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 137 + 248 = 392 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 147 + 704 = 852 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 37 × 72 = 2659 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 15 × 19 = 285 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 108 + 241 = 352 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 27 × 61 = 1647 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 559 + 721 = 1280 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 94 × 48 = 4512 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 90 × 22 = 1980 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 85 = 5442 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 36 = 2556 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 30 × 48 = 1443 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 348 + 389 = 729 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 135 + 561 = 696 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 558 + 641 = 1201 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 64 × 96 = 6144 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 94 × 29 = 2717 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 712 + 199 = 911 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 251 + 340 = 583 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 76 × 56 = 4255 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 453 + 218 = 671 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 772 + 782 = 1548 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 49 × 79 = 3871 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 82 × 82 = 6724 right or wrong? (a) Right (b) Wrong

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