Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 771 · 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 821 + 868 = 1698 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 65 × 24 = 1560 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 45 × 54 = 2430 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 48 × 23 = 1104 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 776 + 243 = 1019 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 829 + 850 = 1679 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 561 + 885 = 1446 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 977 + 648 = 1625 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 50 × 58 = 2902 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 150 + 796 = 946 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 44 × 39 = 1715 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 923 + 795 = 1723 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 53 × 33 = 1749 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 69 × 13 = 893 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 369 + 993 = 1362 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 69 × 57 = 3933 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 72 × 80 = 5760 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 31 × 64 = 1984 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 66 × 23 = 1518 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 242 + 509 = 751 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 77 × 25 = 1925 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 908 + 129 = 1037 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 67 × 92 = 6157 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 49 × 96 = 4696 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 807 + 447 = 1256 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 43 × 76 = 3268 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 476 + 198 = 674 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 191 + 680 = 868 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 27 × 24 = 648 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 58 × 73 = 4234 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 572 + 170 = 742 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 83 = 2072 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 294 + 134 = 428 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 22 × 40 = 879 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 570 + 477 = 1047 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 945 + 447 = 1392 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 47 × 48 = 2247 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 79 × 44 = 3480 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 79 × 55 = 4348 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 31 × 45 = 1395 right or wrong? (a) Right (b) Wrong

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