Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 754 · 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 296 + 725 = 1021 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 802 + 796 = 1598 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 80 × 28 = 2240 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 38 × 56 = 2135 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 877 + 689 = 1574 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 88 × 17 = 1504 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 917 + 595 = 1511 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 853 + 696 = 1549 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 165 + 907 = 1069 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 30 = 660 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 561 + 895 = 1459 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 579 + 544 = 1123 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 20 × 57 = 1134 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 82 × 15 = 1236 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 111 + 515 = 626 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 96 × 36 = 3453 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 28 × 44 = 1232 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 591 + 324 = 915 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 925 + 285 = 1210 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 551 + 698 = 1249 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 963 + 604 = 1567 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 673 + 869 = 1551 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 451 + 552 = 1000 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 854 + 524 = 1378 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 22 × 65 = 1430 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 630 + 541 = 1171 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 560 + 961 = 1518 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 13 × 25 = 325 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 177 + 557 = 737 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 80 × 26 = 2080 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 84 × 99 = 8316 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 451 + 860 = 1311 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 533 + 669 = 1202 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 50 × 30 = 1500 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 60 × 82 = 4929 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 297 + 978 = 1275 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 694 + 143 = 834 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 643 + 828 = 1467 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 759 + 499 = 1258 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 827 + 526 = 1352 right or wrong? (a) Right (b) Wrong

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