Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 358 · 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 757 + 274 = 1028 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 940 + 587 = 1524 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 137 + 464 = 605 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 84 × 67 = 5636 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 56 × 48 = 2688 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 16 × 61 = 976 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 43 × 53 = 2279 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 747 + 712 = 1459 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 920 + 748 = 1660 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 31 × 12 = 376 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 30 × 27 = 815 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 78 × 19 = 1476 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 25 × 18 = 458 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 75 × 95 = 7125 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 60 × 38 = 2279 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 968 + 903 = 1871 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 223 + 455 = 678 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 13 × 75 = 975 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 731 + 457 = 1194 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 63 × 82 = 5174 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 579 + 950 = 1538 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 737 + 133 = 868 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 78 × 38 = 2964 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 402 + 164 = 563 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 25 × 35 = 875 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 69 × 92 = 6349 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 48 × 85 = 4087 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 138 + 438 = 576 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 846 + 888 = 1741 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 33 × 73 = 2414 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 45 × 56 = 2520 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 360 + 199 = 559 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 48 × 92 = 4417 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 39 × 54 = 2109 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 46 × 64 = 2944 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 37 × 49 = 1811 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 98 × 73 = 7154 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 29 = 348 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 797 + 894 = 1691 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 994 + 479 = 1473 right or wrong? (a) Right (b) Wrong

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