Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 200 · 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 308 + 846 = 1146 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 59 × 54 = 3186 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 24 × 51 = 1221 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 266 + 196 = 462 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 839 + 164 = 999 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 80 × 12 = 960 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 69 × 15 = 1035 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 64 × 28 = 1792 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 652 + 684 = 1340 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 682 + 290 = 972 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 631 + 203 = 841 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 292 + 611 = 903 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 855 + 873 = 1728 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 213 + 822 = 1035 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 896 + 155 = 1056 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 901 + 749 = 1650 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 203 + 183 = 386 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 65 × 46 = 2988 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 286 + 738 = 1024 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 537 + 291 = 828 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 63 × 26 = 1638 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 51 × 50 = 2550 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 731 + 433 = 1164 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 788 + 963 = 1752 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 48 × 55 = 2633 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 28 × 50 = 1392 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 339 + 167 = 506 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 43 × 39 = 1671 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 29 × 27 = 775 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 20 × 87 = 1740 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 834 + 432 = 1266 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 175 + 322 = 497 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 297 + 590 = 887 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 45 × 89 = 4005 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 45 × 80 = 3600 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 867 + 542 = 1410 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 218 + 365 = 584 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 764 + 938 = 1700 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 26 × 46 = 1196 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 25 × 27 = 675 right or wrong? (a) Right (b) Wrong

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