Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 829 · 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 386 + 246 = 632 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 199 + 842 = 1035 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 71 × 71 = 5041 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 650 + 531 = 1181 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 69 × 20 = 1380 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 35 × 41 = 1431 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 566 + 129 = 686 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 54 × 80 = 4329 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 24 × 57 = 1363 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 35 × 37 = 1295 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 664 + 235 = 907 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 64 × 39 = 2487 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 531 + 454 = 985 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 85 × 33 = 2800 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 922 + 222 = 1138 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 95 × 63 = 5980 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 67 × 34 = 2275 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 739 + 151 = 890 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 352 + 682 = 1025 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 13 × 56 = 728 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 55 × 78 = 4291 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 17 = 425 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 25 × 71 = 1773 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 883 + 492 = 1375 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 904 + 176 = 1080 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 176 + 324 = 492 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 18 × 36 = 646 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 91 × 29 = 2637 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 863 + 331 = 1194 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 661 + 733 = 1394 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 197 + 305 = 502 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 803 + 443 = 1248 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 880 + 233 = 1104 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 49 × 53 = 2597 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 54 × 40 = 2160 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 242 + 491 = 733 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 35 = 1148 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 24 × 96 = 2313 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 66 × 12 = 801 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 42 × 43 = 1806 right or wrong? (a) Right (b) Wrong

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