Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 531 · 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 509 + 229 = 738 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 54 × 86 = 4644 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 702 + 863 = 1565 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 36 × 39 = 1404 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 230 + 200 = 431 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 543 + 129 = 666 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 71 × 29 = 2058 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 550 + 298 = 848 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 249 + 119 = 368 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 38 × 74 = 2812 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 207 + 787 = 994 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 30 × 34 = 1024 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 155 + 355 = 510 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 283 + 826 = 1109 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 424 + 600 = 1015 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 33 × 60 = 1980 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 411 + 282 = 693 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 195 + 745 = 940 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 50 × 37 = 1850 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 29 × 63 = 1819 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 226 + 938 = 1164 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 38 × 62 = 2356 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 126 + 353 = 474 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 553 + 197 = 758 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 49 × 24 = 1176 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 60 = 1981 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 25 × 86 = 2150 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 13 × 83 = 1087 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 440 + 293 = 733 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 79 × 89 = 7026 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 975 + 311 = 1287 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 17 × 90 = 1526 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 24 × 33 = 792 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 820 + 986 = 1806 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 32 = 1152 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 808 + 204 = 1012 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 31 × 35 = 1085 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 841 + 961 = 1796 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 27 × 26 = 702 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 210 + 961 = 1171 right or wrong? (a) Wrong (b) Right

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