Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 918 · 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 71 × 21 = 1491 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 345 + 746 = 1091 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 28 × 86 = 2403 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 930 + 292 = 1225 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 190 + 144 = 334 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 867 + 330 = 1206 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 13 × 26 = 340 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 28 × 49 = 1376 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 94 × 18 = 1692 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 71 × 89 = 6326 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 811 + 726 = 1537 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 528 + 839 = 1367 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 389 + 309 = 698 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 199 + 850 = 1049 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 28 × 17 = 470 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 42 × 24 = 1017 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 93 × 45 = 4185 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 98 × 19 = 1862 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 122 + 700 = 822 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 63 × 24 = 1512 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 937 + 591 = 1524 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 557 + 909 = 1466 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 73 = 6059 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 20 × 42 = 843 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 81 × 86 = 6966 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 242 + 246 = 488 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 13 × 96 = 1248 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 32 × 93 = 2976 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 65 × 37 = 2410 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 19 × 28 = 532 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 95 × 18 = 1706 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 44 × 92 = 4048 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 78 × 62 = 4843 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 42 × 41 = 1718 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 46 × 35 = 1604 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 403 + 688 = 1091 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 152 + 808 = 960 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 351 + 585 = 934 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 371 + 140 = 512 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 13 × 15 = 200 right or wrong? (a) Right (b) Wrong

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