Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 727 · 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 887 + 411 = 1298 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 36 × 53 = 1908 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 271 + 616 = 887 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 39 × 75 = 2925 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 931 + 151 = 1077 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 48 × 48 = 2304 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 62 × 73 = 4526 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 343 + 680 = 1023 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 853 + 159 = 1012 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 20 × 13 = 260 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 71 × 70 = 4966 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 26 × 42 = 1092 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 40 × 76 = 3041 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 405 + 593 = 998 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 31 × 38 = 1178 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 69 × 69 = 4763 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 29 × 82 = 2378 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 55 × 16 = 880 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 44 × 89 = 3916 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 754 + 974 = 1728 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 860 + 636 = 1494 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 17 × 73 = 1248 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 26 × 32 = 832 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 48 × 71 = 3408 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 481 + 337 = 818 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 47 × 86 = 4039 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 63 × 76 = 4783 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 736 + 859 = 1603 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 55 × 78 = 4285 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 43 × 31 = 1333 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 167 + 979 = 1146 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 238 + 595 = 833 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 69 × 86 = 5934 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 83 × 80 = 6640 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 431 + 403 = 834 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 31 × 57 = 1767 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 498 + 178 = 676 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 808 + 476 = 1289 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 80 × 20 = 1600 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 668 + 336 = 1000 right or wrong? (a) Right (b) Wrong

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