Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 239 · 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 244 + 737 = 981 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 73 × 83 = 6059 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 41 × 57 = 2331 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 810 + 454 = 1264 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 13 × 13 = 169 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 751 + 293 = 1040 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 37 × 35 = 1300 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 62 × 90 = 5580 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 45 × 54 = 2430 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 915 + 797 = 1712 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 65 × 62 = 4030 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 33 × 35 = 1155 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 751 + 800 = 1551 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 96 × 93 = 8928 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 831 + 245 = 1076 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 914 + 655 = 1569 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 749 + 213 = 963 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 29 × 34 = 986 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 45 × 78 = 3514 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 904 + 737 = 1634 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 71 × 56 = 3976 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 720 + 559 = 1275 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 582 + 810 = 1392 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 38 × 46 = 1749 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 260 + 419 = 679 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 204 + 284 = 488 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 89 × 84 = 7476 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 26 × 13 = 337 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 33 × 86 = 2838 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 699 + 176 = 875 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 21 × 47 = 987 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 485 + 733 = 1218 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 12 = 232 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 907 + 724 = 1631 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 19 × 81 = 1540 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 87 × 88 = 7647 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 179 + 808 = 985 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 181 + 740 = 923 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 48 × 83 = 3984 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 360 + 456 = 819 right or wrong? (a) Right (b) Wrong

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