Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 360 · 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 75 × 43 = 3219 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 85 × 81 = 6885 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 366 + 682 = 1052 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 745 + 584 = 1321 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 73 × 47 = 3431 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 302 + 307 = 609 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 60 × 37 = 2211 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 24 × 38 = 912 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 619 + 272 = 891 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 13 × 61 = 793 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 95 × 37 = 3517 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 805 + 396 = 1196 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 69 × 99 = 6831 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 79 × 91 = 7189 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 750 + 142 = 892 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 685 + 547 = 1232 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 20 × 87 = 1740 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 93 × 14 = 1302 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 451 + 239 = 690 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 54 × 43 = 2322 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 841 + 832 = 1674 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 822 + 131 = 961 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 679 + 441 = 1120 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 96 × 28 = 2688 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 591 + 940 = 1531 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 826 + 660 = 1486 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 778 + 501 = 1279 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 44 × 83 = 3644 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 368 + 501 = 869 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 30 × 26 = 787 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 510 + 802 = 1312 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 574 + 637 = 1211 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 85 × 52 = 4411 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 742 + 261 = 1003 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 16 × 84 = 1344 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 586 + 991 = 1581 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 30 × 99 = 2972 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 36 × 97 = 3492 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 581 + 432 = 1013 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 345 + 333 = 672 right or wrong? (a) Wrong (b) Right

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