Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 710 · 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 69 × 69 = 4761 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 95 × 34 = 3230 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 501 + 278 = 779 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 217 + 312 = 522 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 14 × 47 = 658 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 14 × 30 = 415 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 466 + 773 = 1239 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 57 × 52 = 2965 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 176 + 809 = 985 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 986 + 299 = 1285 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 93 × 81 = 7533 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 125 + 124 = 249 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 421 + 108 = 522 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 934 + 193 = 1127 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 36 × 26 = 936 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 95 × 48 = 4567 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 29 × 72 = 2088 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 328 + 569 = 897 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 14 = 672 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 85 × 32 = 2712 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 559 + 603 = 1162 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 21 × 98 = 2058 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 838 + 264 = 1101 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 34 × 78 = 2652 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 603 + 475 = 1075 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 80 × 88 = 7039 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 83 × 58 = 4822 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 66 × 29 = 1912 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 43 × 42 = 1806 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 14 × 38 = 527 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 15 × 72 = 1080 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 49 × 37 = 1813 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 21 × 48 = 1007 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 72 × 37 = 2667 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 335 + 454 = 791 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 975 + 125 = 1108 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 80 × 52 = 4164 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 53 × 26 = 1378 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 26 × 36 = 936 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 478 + 212 = 690 right or wrong? (a) Right (b) Wrong

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