Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 381 · 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 659 + 247 = 906 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 66 × 60 = 3960 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 145 + 672 = 810 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 802 + 767 = 1569 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 61 × 81 = 4943 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 79 × 97 = 7658 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 21 × 38 = 798 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 97 × 35 = 3394 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 21 × 81 = 1701 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 554 + 805 = 1354 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 62 × 36 = 2232 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 969 + 869 = 1841 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 25 × 28 = 698 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 15 × 49 = 737 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 742 + 283 = 1025 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 72 × 12 = 863 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 43 = 4088 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 585 + 569 = 1151 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 728 + 363 = 1082 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 16 × 67 = 1081 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 776 + 839 = 1615 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 136 + 568 = 704 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 812 + 851 = 1663 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 217 + 478 = 703 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 19 × 68 = 1292 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 97 × 14 = 1364 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 115 + 561 = 676 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 26 × 45 = 1161 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 98 × 66 = 6468 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 37 × 25 = 925 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 344 + 282 = 622 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 917 + 395 = 1312 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 892 + 265 = 1157 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 67 × 14 = 938 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 81 × 93 = 7540 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 27 × 30 = 807 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 558 + 304 = 859 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 434 + 894 = 1328 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 35 × 59 = 2060 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 99 × 67 = 6636 right or wrong? (a) Wrong (b) Right

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