Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 503 · 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 33 × 15 = 495 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 965 + 907 = 1875 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 76 × 47 = 3568 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 22 × 37 = 816 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 938 + 713 = 1656 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 494 + 901 = 1395 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 98 × 65 = 6370 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 900 + 642 = 1542 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 75 × 61 = 4582 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 38 × 50 = 1898 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 652 + 224 = 872 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 90 × 63 = 5670 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 48 × 30 = 1444 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 234 + 321 = 548 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 695 + 810 = 1505 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 778 + 336 = 1112 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 77 × 43 = 3310 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 645 + 134 = 779 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 907 + 306 = 1214 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 705 + 584 = 1287 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 53 × 89 = 4721 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 741 + 207 = 948 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 47 × 74 = 3471 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 202 + 566 = 768 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 970 + 719 = 1689 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 15 × 71 = 1065 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 502 + 149 = 643 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 61 × 74 = 4514 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 824 + 763 = 1587 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 286 + 198 = 484 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 28 × 57 = 1596 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 140 + 271 = 402 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 23 × 95 = 2186 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 78 = 2652 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 20 = 1200 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 49 × 56 = 2738 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 160 + 907 = 1067 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 326 + 346 = 669 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 534 + 259 = 793 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 66 = 784 right or wrong? (a) Wrong (b) Right

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