Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 555 · 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 698 + 367 = 1062 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 424 + 450 = 874 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 579 + 416 = 995 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 663 + 572 = 1233 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 892 + 131 = 1023 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 80 × 83 = 6640 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 532 + 374 = 906 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 866 + 133 = 999 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 958 + 131 = 1097 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 920 + 421 = 1339 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 12 × 16 = 187 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 691 + 732 = 1421 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 17 × 96 = 1632 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 791 + 204 = 995 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 611 + 952 = 1563 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 67 × 49 = 3283 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 97 × 31 = 3015 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 83 × 65 = 5387 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 44 × 87 = 3833 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 891 + 909 = 1795 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 51 × 67 = 3417 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 287 + 306 = 596 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 502 + 785 = 1294 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 99 × 29 = 2871 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 45 = 3241 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 24 × 59 = 1416 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 46 = 4461 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 594 + 162 = 763 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 944 + 878 = 1822 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 87 = 2262 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 376 + 416 = 801 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 52 × 37 = 1924 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 29 × 74 = 2155 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 294 + 774 = 1060 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 623 + 833 = 1456 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 15 × 49 = 732 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 364 + 486 = 850 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 897 + 665 = 1562 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 143 + 614 = 757 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 996 + 193 = 1183 right or wrong? (a) Wrong (b) Right

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