Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 692 · 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 591 + 650 = 1241 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 40 × 58 = 2320 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 25 × 89 = 2225 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 71 × 59 = 4194 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 703 + 125 = 828 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 51 × 54 = 2762 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 424 + 281 = 703 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 275 + 137 = 412 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 980 + 512 = 1501 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 437 + 593 = 1027 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 90 × 92 = 8280 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 372 + 209 = 581 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 431 + 749 = 1187 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 775 + 766 = 1533 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 53 × 33 = 1747 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 80 × 77 = 6159 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 93 × 36 = 3357 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 871 + 722 = 1593 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 895 + 320 = 1215 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 659 + 422 = 1084 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 88 × 69 = 6072 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 576 + 168 = 748 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 330 + 223 = 552 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 41 × 94 = 3854 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 709 + 606 = 1314 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 154 + 127 = 281 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 439 + 218 = 660 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 68 × 43 = 2918 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 559 + 417 = 976 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 46 × 26 = 1188 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 84 × 14 = 1176 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 709 + 692 = 1400 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 52 × 28 = 1447 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 91 × 67 = 6089 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 83 × 13 = 1079 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 251 + 755 = 1006 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 822 + 934 = 1757 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 22 × 58 = 1276 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 52 × 28 = 1456 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 859 + 601 = 1460 right or wrong? (a) Wrong (b) Right

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