Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 637 · 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 33 × 38 = 1254 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 961 + 759 = 1720 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 917 + 269 = 1186 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 14 × 94 = 1310 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 25 × 60 = 1500 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 39 × 39 = 1513 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 69 × 30 = 2070 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 857 + 572 = 1429 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 71 × 82 = 5822 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 547 + 839 = 1382 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 22 × 96 = 2112 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 78 × 44 = 3441 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 204 + 286 = 498 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 82 × 36 = 2953 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 76 × 26 = 1976 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 582 + 909 = 1492 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 65 × 67 = 4363 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 825 + 360 = 1186 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 61 × 15 = 909 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 95 × 92 = 8740 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 34 × 76 = 2585 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 88 × 21 = 1848 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 46 × 62 = 2847 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 613 + 288 = 892 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 691 + 201 = 890 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 84 = 6375 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 904 + 485 = 1391 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 16 × 48 = 773 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 492 + 365 = 859 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 38 × 28 = 1064 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 25 = 525 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 37 × 18 = 666 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 690 + 765 = 1455 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 938 + 584 = 1524 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 97 = 4656 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 790 + 354 = 1143 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 682 + 948 = 1630 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 94 × 38 = 3567 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 82 × 41 = 3362 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 644 + 485 = 1123 right or wrong? (a) Right (b) Wrong

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