Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 460 · 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 857 + 704 = 1561 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 30 × 91 = 2734 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 505 + 932 = 1437 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 66 × 20 = 1328 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 905 + 894 = 1803 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 69 × 48 = 3312 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 170 + 364 = 534 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 52 × 82 = 4258 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 33 × 66 = 2185 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 62 × 25 = 1550 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 89 × 50 = 4447 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 68 × 25 = 1691 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 81 × 20 = 1612 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 91 × 52 = 4728 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 477 + 539 = 1016 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 706 + 759 = 1472 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 77 × 83 = 6396 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 41 × 74 = 3043 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 671 + 190 = 866 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 30 × 60 = 1800 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 619 + 518 = 1137 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 96 × 45 = 4320 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 287 + 995 = 1282 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 82 × 95 = 7799 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 86 × 38 = 3262 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 884 + 125 = 1011 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 585 + 999 = 1584 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 151 + 378 = 532 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 41 × 26 = 1066 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 562 + 605 = 1167 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 73 × 84 = 6124 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 380 + 271 = 654 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 26 = 907 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 152 + 551 = 698 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 78 × 25 = 1950 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 785 + 346 = 1128 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 43 × 65 = 2795 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 200 + 760 = 954 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 12 × 24 = 296 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 48 × 55 = 2645 right or wrong? (a) Right (b) Wrong

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