Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 982 · 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 68 × 86 = 5852 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 69 × 78 = 5384 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 204 + 144 = 347 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 955 + 242 = 1192 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 706 + 799 = 1505 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 44 × 18 = 797 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 299 + 479 = 778 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 85 = 1190 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 37 × 54 = 1998 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 396 + 876 = 1272 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 416 + 563 = 979 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 662 + 341 = 998 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 156 + 335 = 491 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 79 × 97 = 7663 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 923 + 703 = 1633 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 538 + 320 = 858 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 186 + 520 = 706 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 596 + 406 = 1002 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 13 × 27 = 351 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 96 × 41 = 3936 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 19 × 27 = 513 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 55 × 17 = 935 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 81 × 81 = 6561 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 31 × 55 = 1701 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 33 × 67 = 2212 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 813 + 352 = 1157 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 29 × 84 = 2436 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 618 + 129 = 747 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 84 × 43 = 3612 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 682 + 946 = 1628 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 549 + 208 = 757 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 192 + 283 = 475 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 317 + 118 = 435 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 39 × 96 = 3740 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 696 + 229 = 920 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 834 + 474 = 1312 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 146 + 589 = 735 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 92 × 32 = 2940 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 76 × 63 = 4785 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 935 + 405 = 1340 right or wrong? (a) Right (b) Wrong

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