Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 600 · 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 723 + 737 = 1460 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 264 + 850 = 1112 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 349 + 728 = 1077 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 31 × 56 = 1743 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 66 × 48 = 3168 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 50 × 14 = 704 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 148 + 715 = 859 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 91 × 84 = 7644 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 832 + 709 = 1536 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 56 × 90 = 5040 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 165 + 550 = 713 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 81 × 27 = 2187 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 286 + 583 = 863 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 821 + 226 = 1047 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 92 × 96 = 8832 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 49 × 88 = 4315 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 25 × 86 = 2158 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 728 + 719 = 1447 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 27 × 31 = 834 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 323 + 405 = 733 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 29 × 19 = 551 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 565 + 809 = 1374 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 21 × 39 = 819 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 179 + 949 = 1128 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 17 × 80 = 1355 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 772 + 787 = 1558 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 510 + 906 = 1416 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 905 + 339 = 1243 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 119 + 637 = 756 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 752 + 855 = 1601 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 520 + 877 = 1402 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 79 × 16 = 1264 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 71 × 29 = 2063 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 92 × 73 = 6716 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 17 = 1584 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 810 + 716 = 1526 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 259 + 852 = 1111 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 91 × 12 = 1094 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 826 + 427 = 1252 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 271 + 675 = 941 right or wrong? (a) Right (b) Wrong

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