Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 83 · 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 243 + 309 = 552 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 45 × 14 = 636 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 54 × 75 = 4042 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 549 + 622 = 1166 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 164 + 335 = 499 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 680 + 796 = 1468 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 25 × 24 = 601 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 311 + 561 = 871 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 633 + 361 = 992 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 394 + 683 = 1070 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 90 × 19 = 1718 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 634 + 374 = 1008 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 48 × 56 = 2695 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 22 × 35 = 770 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 199 + 634 = 828 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 160 + 113 = 264 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 279 + 797 = 1076 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 21 × 24 = 504 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 684 + 888 = 1563 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 611 + 480 = 1091 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 72 × 54 = 3888 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 50 × 91 = 4550 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 24 × 53 = 1280 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 75 × 22 = 1647 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 35 = 2520 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 206 + 875 = 1075 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 94 × 34 = 3200 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 90 × 99 = 8910 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 14 × 55 = 774 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 906 + 830 = 1736 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 91 × 24 = 2183 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 94 × 95 = 8935 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 273 + 949 = 1222 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 30 × 32 = 960 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 12 × 65 = 780 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 927 + 408 = 1335 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 55 × 89 = 4891 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 48 = 576 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 49 × 72 = 3528 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 213 + 278 = 500 right or wrong? (a) Wrong (b) Right

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