Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 611 · 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 411 + 811 = 1222 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 36 × 55 = 1980 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 84 × 82 = 6886 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 172 + 604 = 768 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 444 + 517 = 961 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 47 × 22 = 1035 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 446 + 405 = 856 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 59 × 36 = 2128 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 67 × 32 = 2144 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 757 + 866 = 1622 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 38 × 15 = 565 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 857 + 187 = 1044 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 668 + 120 = 790 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 80 × 30 = 2400 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 16 × 70 = 1120 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 73 × 63 = 4599 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 26 × 42 = 1092 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 81 × 38 = 3078 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 57 × 19 = 1075 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 71 × 34 = 2414 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 43 × 53 = 2279 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 382 + 652 = 1029 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 38 × 75 = 2850 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 743 + 811 = 1554 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 429 + 719 = 1148 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 468 + 110 = 574 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 620 + 810 = 1428 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 60 × 65 = 3900 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 951 + 475 = 1434 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 409 + 549 = 952 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 49 × 71 = 3479 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 256 + 410 = 671 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 12 × 19 = 226 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 14 × 19 = 265 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 570 + 964 = 1525 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 37 × 60 = 2211 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 484 + 565 = 1049 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 42 × 91 = 3822 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 927 + 109 = 1041 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 252 + 886 = 1146 right or wrong? (a) Right (b) Wrong

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