Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 665 · 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 271 + 664 = 943 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 78 × 48 = 3738 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 414 + 839 = 1253 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 94 × 17 = 1598 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 615 + 594 = 1209 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 376 + 145 = 522 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 734 + 613 = 1338 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 944 + 158 = 1097 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 415 + 667 = 1082 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 16 × 25 = 400 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 395 + 813 = 1216 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 34 × 97 = 3297 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 955 + 653 = 1608 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 28 × 41 = 1148 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 577 + 119 = 696 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 47 × 62 = 2914 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 20 × 14 = 280 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 48 × 60 = 2880 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 33 × 29 = 957 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 40 × 94 = 3760 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 523 + 252 = 775 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 88 × 21 = 1844 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 158 + 207 = 365 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 84 × 86 = 7222 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 97 × 69 = 6684 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 235 + 269 = 507 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 732 + 125 = 857 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 12 × 35 = 420 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 73 × 97 = 7081 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 82 × 42 = 3435 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 12 × 88 = 1048 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 743 + 824 = 1567 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 50 × 16 = 800 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 56 × 56 = 3140 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 729 + 422 = 1151 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 626 + 418 = 1044 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 53 × 59 = 3133 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 67 × 74 = 4957 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 99 × 52 = 5148 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 65 × 61 = 3965 right or wrong? (a) Wrong (b) Right

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