Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 409 · 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 18 × 46 = 828 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 95 × 88 = 8360 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 621 + 234 = 853 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 314 + 932 = 1248 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 767 + 926 = 1691 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 971 + 485 = 1456 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 27 × 97 = 2613 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 845 + 188 = 1035 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 718 + 448 = 1163 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 78 × 83 = 6474 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 51 × 64 = 3273 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 489 + 942 = 1431 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 18 × 25 = 446 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 287 + 898 = 1185 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 819 + 605 = 1424 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 317 + 781 = 1106 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 858 + 687 = 1541 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 494 + 684 = 1178 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 23 × 17 = 391 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 923 + 923 = 1843 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 78 × 29 = 2256 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 13 × 85 = 1105 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 99 × 76 = 7524 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 572 + 148 = 720 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 43 × 79 = 3404 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 580 + 970 = 1558 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 66 × 26 = 1707 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 129 + 152 = 284 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 419 + 184 = 603 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 225 + 688 = 918 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 868 + 420 = 1288 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 82 × 90 = 7387 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 83 × 65 = 5395 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 222 + 504 = 724 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 494 + 321 = 815 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 92 × 61 = 5615 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 92 × 49 = 4511 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 63 × 51 = 3219 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 79 × 66 = 5214 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 214 + 344 = 558 right or wrong? (a) Right (b) Wrong

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