Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 129 · 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 755 + 908 = 1663 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 727 + 119 = 849 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 22 × 39 = 858 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 83 × 36 = 2994 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 99 × 75 = 7425 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 66 × 35 = 2314 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 19 × 72 = 1368 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 25 × 79 = 1975 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 46 × 19 = 878 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 472 + 998 = 1476 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 87 × 70 = 6082 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 696 + 349 = 1045 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 145 + 443 = 588 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 61 × 52 = 3167 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 60 = 3059 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 528 + 282 = 816 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 22 × 28 = 616 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 58 × 38 = 2204 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 39 × 69 = 2691 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 835 + 528 = 1355 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 58 × 50 = 2900 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 87 × 12 = 1044 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 16 × 17 = 272 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 29 × 36 = 1052 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 42 = 2223 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 15 × 64 = 960 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 90 × 51 = 4590 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 59 × 77 = 4547 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 884 + 555 = 1440 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 737 + 791 = 1528 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 29 × 80 = 2320 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 29 × 36 = 1044 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 61 × 53 = 3233 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 223 + 289 = 512 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 84 × 93 = 7812 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 900 + 729 = 1636 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 58 × 17 = 986 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 362 + 309 = 671 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 73 × 85 = 6205 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 307 + 299 = 609 right or wrong? (a) Right (b) Wrong

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