Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 211 · 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 97 × 63 = 6102 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 78 × 85 = 6636 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 27 × 55 = 1480 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 84 × 79 = 6636 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 90 × 35 = 3150 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 694 + 177 = 863 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 92 × 86 = 7912 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 503 + 837 = 1349 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 485 + 653 = 1136 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 782 + 650 = 1432 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 95 × 70 = 6655 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 30 × 35 = 1050 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 222 + 962 = 1184 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 747 + 362 = 1100 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 82 × 20 = 1632 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 40 × 45 = 1800 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 648 + 205 = 862 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 824 + 808 = 1624 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 59 × 84 = 4957 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 254 + 398 = 648 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 333 + 156 = 489 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 57 × 13 = 742 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 970 + 721 = 1690 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 72 × 26 = 1877 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 81 × 51 = 4132 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 43 × 26 = 1114 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 178 + 451 = 629 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 58 × 77 = 4466 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 883 + 469 = 1352 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 76 × 97 = 7372 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 741 + 964 = 1705 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 61 × 75 = 4575 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 557 + 174 = 733 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 296 + 239 = 537 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 139 + 580 = 719 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 84 × 90 = 7560 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 24 × 42 = 1008 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 86 × 99 = 8514 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 671 + 959 = 1631 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 59 × 49 = 2900 right or wrong? (a) Wrong (b) Right

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