Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 775 · 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 499 + 941 = 1439 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 106 + 918 = 1024 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 89 × 55 = 4895 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 86 × 65 = 5590 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 230 + 795 = 1025 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 94 × 93 = 8749 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 69 × 97 = 6693 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 604 + 288 = 892 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 34 × 63 = 2151 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 34 × 33 = 1122 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 16 × 40 = 640 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 38 × 63 = 2394 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 46 × 50 = 2292 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 52 × 30 = 1563 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 19 × 93 = 1767 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 742 + 782 = 1524 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 93 × 27 = 2506 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 29 × 51 = 1479 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 22 × 73 = 1605 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 208 + 142 = 350 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 702 + 168 = 870 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 65 × 90 = 5846 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 14 × 99 = 1389 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 168 + 959 = 1127 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 743 + 402 = 1136 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 68 × 29 = 1978 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 83 × 89 = 7389 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 179 + 769 = 948 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 165 + 603 = 777 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 724 + 890 = 1614 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 24 × 42 = 1008 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 871 + 592 = 1463 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 51 × 43 = 2189 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 827 + 131 = 951 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 872 + 331 = 1209 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 856 + 624 = 1473 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 81 × 38 = 3078 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 82 × 86 = 7052 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 974 + 162 = 1136 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 764 + 499 = 1263 right or wrong? (a) Right (b) Wrong

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