Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 894 · 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 469 + 816 = 1285 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 792 + 423 = 1215 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 39 × 23 = 897 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 547 + 800 = 1347 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 62 × 71 = 4402 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 67 × 12 = 813 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 81 × 38 = 3072 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 77 × 85 = 6545 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 83 × 23 = 1909 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 26 × 63 = 1643 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 95 = 1801 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 185 + 980 = 1165 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 817 + 671 = 1488 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 864 + 231 = 1095 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 797 + 381 = 1178 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 21 × 17 = 349 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 61 × 90 = 5492 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 44 × 87 = 3828 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 83 × 86 = 7138 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 74 × 45 = 3331 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 414 + 848 = 1262 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 76 × 21 = 1599 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 87 × 58 = 5046 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 33 × 79 = 2607 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 768 + 136 = 904 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 490 + 452 = 937 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 618 + 708 = 1326 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 31 × 76 = 2355 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 384 + 155 = 539 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 24 × 48 = 1154 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 73 × 23 = 1679 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 22 × 73 = 1601 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 308 + 167 = 474 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 720 + 327 = 1047 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 92 × 88 = 8096 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 56 × 32 = 1792 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 491 + 604 = 1095 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 357 + 698 = 1059 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 64 × 16 = 1020 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 40 × 18 = 720 right or wrong? (a) Right (b) Wrong

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