Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 151 · 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 29 × 58 = 1684 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 85 × 18 = 1530 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 42 × 18 = 754 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 20 × 77 = 1537 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 422 + 483 = 896 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 486 + 157 = 635 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 149 + 825 = 981 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 30 × 84 = 2517 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 30 × 89 = 2673 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 77 × 38 = 2927 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 442 + 226 = 668 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 823 + 421 = 1245 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 77 × 68 = 5227 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 684 + 171 = 863 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 28 × 84 = 2352 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 62 = 2852 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 22 × 67 = 1474 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 448 + 331 = 777 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 20 × 31 = 618 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 57 × 66 = 3762 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 649 + 335 = 981 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 898 + 390 = 1288 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 53 × 47 = 2491 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 13 × 96 = 1248 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 642 + 426 = 1070 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 32 × 25 = 800 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 39 × 15 = 577 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 294 + 301 = 595 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 79 = 6959 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 76 × 54 = 4104 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 495 + 709 = 1204 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 18 × 87 = 1563 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 94 × 84 = 7896 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 242 + 711 = 953 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 68 × 30 = 2037 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 977 + 293 = 1266 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 599 + 812 = 1411 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 75 × 97 = 7275 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 349 + 461 = 806 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 564 + 815 = 1381 right or wrong? (a) Right (b) Wrong

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