Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 483 · 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 216 + 922 = 1136 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 794 + 625 = 1419 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 87 × 52 = 4527 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 448 + 901 = 1349 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 460 + 425 = 879 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 80 × 80 = 6400 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 45 × 26 = 1170 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 48 × 18 = 864 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 75 × 66 = 4950 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 72 × 87 = 6264 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 76 × 95 = 7225 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 70 × 97 = 6790 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 812 + 124 = 933 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 26 × 61 = 1584 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 65 × 74 = 4810 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 560 + 442 = 1002 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 748 + 322 = 1070 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 682 + 454 = 1134 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 19 × 16 = 304 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 42 × 37 = 1553 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 360 + 466 = 835 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 108 + 345 = 453 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 50 × 48 = 2392 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 51 × 99 = 5049 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 114 + 486 = 594 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 755 + 769 = 1529 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 22 × 38 = 836 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 684 + 935 = 1625 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 843 + 502 = 1347 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 990 + 865 = 1855 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 194 + 222 = 416 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 37 × 19 = 703 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 276 + 958 = 1227 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 107 + 488 = 595 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 12 × 89 = 1062 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 21 × 29 = 609 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 28 × 70 = 1952 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 79 × 27 = 2128 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 61 × 72 = 4397 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 47 × 53 = 2498 right or wrong? (a) Right (b) Wrong

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