Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 597 · 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 439 + 112 = 560 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 76 × 64 = 4866 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 12 × 47 = 564 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 878 + 872 = 1749 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 95 × 30 = 2850 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 32 × 85 = 2719 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 13 × 71 = 923 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 196 + 190 = 378 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 540 + 989 = 1529 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 54 × 70 = 3780 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 72 × 41 = 2953 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 37 × 16 = 598 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 21 × 53 = 1113 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 26 × 87 = 2264 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 75 × 91 = 6820 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 70 × 45 = 3150 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 877 + 442 = 1323 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 663 + 495 = 1158 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 140 + 175 = 312 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 72 × 43 = 3093 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 85 × 95 = 8075 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 255 + 155 = 410 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 851 + 927 = 1771 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 74 × 32 = 2368 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 41 × 30 = 1230 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 152 + 606 = 758 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 315 + 211 = 522 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 154 + 312 = 466 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 985 + 757 = 1742 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 178 + 659 = 837 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 685 + 419 = 1105 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 14 × 28 = 400 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 364 + 773 = 1145 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 691 + 430 = 1121 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 490 + 188 = 678 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 30 × 20 = 600 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 43 × 22 = 946 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 944 + 965 = 1909 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 136 + 680 = 813 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 91 × 18 = 1643 right or wrong? (a) Wrong (b) Right

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