Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 262 · 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 543 + 300 = 834 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 69 × 26 = 1789 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 458 + 170 = 636 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 296 + 173 = 474 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 680 + 263 = 943 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 25 × 62 = 1550 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 478 + 145 = 621 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 800 + 494 = 1294 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 384 + 726 = 1110 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 156 + 865 = 1027 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 620 + 786 = 1408 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 31 × 13 = 403 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 45 × 60 = 2700 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 27 × 46 = 1236 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 17 × 15 = 255 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 410 + 507 = 917 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 345 + 287 = 636 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 64 × 30 = 1920 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 828 + 348 = 1176 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 25 × 51 = 1275 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 49 × 27 = 1329 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 49 × 12 = 588 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 71 × 91 = 6461 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 40 × 15 = 602 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 621 + 169 = 790 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 110 + 617 = 727 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 739 + 303 = 1042 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 97 × 76 = 7366 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 929 + 554 = 1480 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 158 + 397 = 556 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 150 + 312 = 465 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 825 + 949 = 1774 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 888 + 779 = 1668 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 46 × 38 = 1740 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 133 + 256 = 389 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 228 + 464 = 692 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 95 × 63 = 5985 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 72 × 31 = 2232 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 212 + 714 = 926 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 75 × 20 = 1494 right or wrong? (a) Wrong (b) Right

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