Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 373 · 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 36 × 23 = 820 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 430 + 651 = 1078 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 40 × 49 = 1952 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 647 + 805 = 1452 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 335 + 684 = 1019 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 560 + 157 = 717 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 26 × 22 = 577 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 448 + 513 = 958 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 26 × 97 = 2522 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 84 × 40 = 3358 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 50 × 48 = 2400 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 39 × 67 = 2605 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 772 + 770 = 1542 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 64 × 99 = 6338 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 967 + 800 = 1771 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 729 + 579 = 1301 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 32 × 75 = 2400 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 966 + 266 = 1232 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 81 × 92 = 7453 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 91 × 78 = 7106 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 453 + 133 = 595 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 92 × 68 = 6254 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 770 + 656 = 1433 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 72 × 38 = 2738 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 17 × 95 = 1624 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 65 × 84 = 5453 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 716 + 155 = 868 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 61 × 31 = 1891 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 36 × 19 = 684 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 956 + 634 = 1590 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 443 + 299 = 742 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 40 = 1120 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 83 = 1743 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 33 × 15 = 496 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 13 × 34 = 449 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 55 × 21 = 1155 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 17 × 38 = 646 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 963 + 867 = 1830 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 25 × 94 = 2345 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 78 × 33 = 2574 right or wrong? (a) Right (b) Wrong

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