Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 80 · 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 813 + 890 = 1699 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 846 + 496 = 1342 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 507 + 410 = 917 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 53 × 32 = 1693 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 40 × 33 = 1320 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 819 + 930 = 1757 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 616 + 563 = 1173 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 48 × 87 = 4167 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 193 + 727 = 921 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 179 + 556 = 735 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 439 + 787 = 1226 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 37 × 38 = 1399 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 144 + 248 = 392 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 23 = 527 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 236 + 621 = 848 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 35 × 77 = 2695 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 23 × 89 = 2046 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 29 × 49 = 1428 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 93 × 92 = 8556 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 444 + 434 = 884 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 482 + 838 = 1320 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 13 × 62 = 805 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 208 + 906 = 1114 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 389 + 387 = 778 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 50 × 42 = 2105 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 25 × 89 = 2224 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 83 × 56 = 4649 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 353 + 387 = 748 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 601 + 318 = 919 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 97 × 30 = 2915 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 471 + 960 = 1431 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 51 × 61 = 3114 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 382 + 124 = 503 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 69 × 26 = 1801 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 216 + 798 = 1014 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 40 × 17 = 680 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 965 + 808 = 1773 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 88 × 42 = 3696 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 968 + 875 = 1843 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 92 × 59 = 5419 right or wrong? (a) Wrong (b) Right

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