Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 397 · 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 855 + 574 = 1429 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 60 × 71 = 4251 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 592 + 246 = 838 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 209 + 632 = 848 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 868 + 708 = 1576 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 92 × 13 = 1196 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 507 + 952 = 1462 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 21 × 98 = 2058 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 14 × 90 = 1259 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 321 + 348 = 663 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 35 × 17 = 587 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 56 × 68 = 3803 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 13 = 338 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 238 + 159 = 405 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 57 × 15 = 847 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 50 × 60 = 2998 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 365 + 162 = 531 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 49 × 20 = 980 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 991 + 120 = 1116 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 15 × 95 = 1425 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 322 + 189 = 511 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 20 × 78 = 1560 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 894 + 648 = 1542 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 448 + 331 = 775 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 591 + 457 = 1048 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 652 + 618 = 1266 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 262 + 538 = 794 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 464 + 581 = 1045 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 42 × 38 = 1596 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 89 × 99 = 8805 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 63 × 61 = 3834 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 668 + 726 = 1388 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 35 = 700 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 523 + 387 = 910 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 78 × 40 = 3114 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 796 + 931 = 1727 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 796 + 396 = 1192 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 499 + 660 = 1159 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 81 = 2349 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 918 + 560 = 1478 right or wrong? (a) Wrong (b) Right

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