Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 5 · 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 170 + 818 = 988 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 25 × 66 = 1650 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 91 × 25 = 2275 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 28 × 30 = 840 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 504 + 808 = 1308 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 50 × 70 = 3500 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 208 + 744 = 958 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 773 + 718 = 1487 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 496 + 965 = 1459 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 224 + 375 = 598 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 85 × 58 = 4930 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 537 + 211 = 748 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 968 + 105 = 1080 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 17 × 92 = 1564 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 197 + 211 = 408 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 492 + 557 = 1049 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 27 × 29 = 774 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 449 + 127 = 577 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 928 + 602 = 1532 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 776 + 210 = 986 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 32 × 40 = 1280 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 81 × 80 = 6480 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 33 × 26 = 858 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 84 × 61 = 5124 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 377 + 772 = 1152 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 38 × 41 = 1556 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 164 + 650 = 812 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 94 × 95 = 8921 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 37 × 13 = 481 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 41 × 85 = 3494 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 41 × 87 = 3565 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 61 × 43 = 2627 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 53 × 32 = 1696 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 870 + 359 = 1227 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 13 × 58 = 754 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 12 × 38 = 455 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 53 × 87 = 4611 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 461 + 308 = 776 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 76 × 78 = 5924 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 344 + 746 = 1090 right or wrong? (a) Right (b) Wrong

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