Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 698 · 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 31 × 19 = 589 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 38 × 79 = 3002 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 91 × 74 = 6725 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 54 × 37 = 1998 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 282 + 830 = 1112 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 16 × 28 = 448 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 926 + 935 = 1861 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 48 × 46 = 2208 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 423 + 834 = 1256 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 810 + 833 = 1640 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 31 × 91 = 2815 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 53 × 35 = 1855 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 48 × 97 = 4664 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 28 × 16 = 448 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 809 + 971 = 1780 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 349 + 331 = 680 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 82 × 29 = 2379 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 751 + 135 = 894 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 180 + 459 = 639 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 17 × 74 = 1254 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 459 + 716 = 1175 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 16 × 82 = 1320 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 692 + 839 = 1531 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 43 × 99 = 4257 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 61 × 89 = 5428 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 467 + 557 = 1021 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 34 × 78 = 2652 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 13 × 42 = 547 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 63 × 68 = 4290 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 272 + 595 = 867 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 66 × 55 = 3630 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 86 × 61 = 5246 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 389 + 652 = 1038 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 709 + 700 = 1409 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 711 + 855 = 1560 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 92 × 83 = 7636 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 468 + 424 = 891 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 543 + 183 = 722 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 88 × 74 = 6512 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 465 + 605 = 1070 right or wrong? (a) Right (b) Wrong

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