Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 901 · 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 893 + 464 = 1357 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 60 × 80 = 4808 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 25 × 53 = 1325 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 928 + 802 = 1730 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 48 × 53 = 2540 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 814 + 350 = 1161 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 35 × 62 = 2170 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 46 × 85 = 3910 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 459 + 316 = 775 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 213 + 930 = 1143 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 992 + 216 = 1208 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 81 × 19 = 1544 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 264 + 143 = 402 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 952 + 723 = 1683 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 37 × 50 = 1850 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 576 + 831 = 1416 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 593 + 727 = 1320 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 17 × 39 = 663 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 83 × 68 = 5637 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 417 + 134 = 549 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 961 + 720 = 1681 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 82 × 21 = 1719 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 714 + 938 = 1652 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 58 × 42 = 2436 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 63 × 47 = 2959 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 66 = 4229 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 167 + 813 = 972 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 65 × 89 = 5792 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 24 × 88 = 2112 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 146 + 628 = 774 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 80 × 96 = 7679 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 33 × 48 = 1584 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 968 + 283 = 1251 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 49 × 20 = 980 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 408 + 814 = 1214 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 320 + 892 = 1204 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 580 + 323 = 903 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 90 × 91 = 8190 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 784 + 628 = 1412 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 31 × 37 = 1147 right or wrong? (a) Wrong (b) Right

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