Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 497 · 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 35 × 86 = 3011 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 25 × 46 = 1150 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 61 × 70 = 4270 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 62 × 81 = 5020 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 654 + 329 = 982 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 846 + 587 = 1433 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 76 × 83 = 6304 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 48 × 31 = 1487 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 877 + 946 = 1823 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 42 × 24 = 1002 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 744 + 761 = 1501 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 86 × 83 = 7138 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 38 × 84 = 3192 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 12 × 79 = 948 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 640 + 119 = 763 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 98 × 99 = 9702 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 73 × 18 = 1314 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 15 × 25 = 374 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 218 + 938 = 1148 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 928 + 556 = 1484 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 662 + 376 = 1034 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 468 + 342 = 802 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 28 × 87 = 2436 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 57 × 86 = 4902 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 475 + 223 = 698 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 40 × 99 = 3969 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 87 × 43 = 3748 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 626 + 154 = 789 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 38 × 72 = 2738 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 43 × 21 = 895 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 40 × 23 = 920 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 17 × 99 = 1683 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 67 = 2009 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 36 × 49 = 1760 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 73 = 4380 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 787 + 859 = 1646 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 772 + 708 = 1480 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 82 × 15 = 1230 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 503 + 296 = 799 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 603 + 760 = 1363 right or wrong? (a) Wrong (b) Right

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