Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 902 · 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 676 + 662 = 1342 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 65 × 62 = 4030 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 704 + 279 = 980 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 92 × 92 = 8464 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 61 × 71 = 4328 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 248 + 690 = 938 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 45 × 12 = 540 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 96 × 41 = 3927 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 92 × 60 = 5528 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 58 × 58 = 3364 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 17 × 63 = 1071 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 34 × 59 = 2006 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 91 × 98 = 8920 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 83 × 62 = 5153 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 296 + 176 = 472 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 188 + 323 = 511 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 25 × 17 = 416 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 30 × 78 = 2339 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 62 × 66 = 4090 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 502 + 896 = 1392 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 703 + 991 = 1694 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 148 + 184 = 337 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 953 + 264 = 1217 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 310 + 928 = 1239 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 58 × 85 = 4921 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 24 × 12 = 286 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 31 × 83 = 2575 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 567 + 504 = 1071 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 585 + 626 = 1214 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 748 + 911 = 1658 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 55 × 28 = 1540 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 353 + 784 = 1137 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 65 × 58 = 3775 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 48 × 20 = 960 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 75 × 80 = 6000 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 28 × 83 = 2326 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 79 × 31 = 2450 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 17 × 54 = 916 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 668 + 387 = 1055 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 709 + 820 = 1529 right or wrong? (a) Right (b) Wrong

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