Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 496 · 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 60 × 80 = 4800 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 19 × 92 = 1754 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 41 × 43 = 1763 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 27 × 70 = 1899 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 421 + 116 = 537 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 25 × 15 = 375 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 78 × 65 = 5070 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 31 × 35 = 1085 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 598 + 452 = 1050 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 43 × 30 = 1285 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 32 × 81 = 2592 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 96 × 65 = 6231 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 89 × 64 = 5696 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 42 × 28 = 1181 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 27 × 69 = 1866 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 919 + 407 = 1326 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 67 × 69 = 4623 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 33 × 58 = 1913 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 92 × 98 = 9024 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 720 + 122 = 842 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 413 + 359 = 764 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 15 × 82 = 1230 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 484 + 615 = 1099 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 79 × 60 = 4744 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 156 + 350 = 515 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 918 + 155 = 1078 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 360 + 984 = 1344 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 650 + 670 = 1320 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 83 × 88 = 7304 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 84 × 94 = 7900 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 503 + 787 = 1284 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 128 + 376 = 504 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 95 × 46 = 4374 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 51 × 13 = 660 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 72 × 66 = 4746 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 469 + 381 = 850 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 28 × 82 = 2301 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 477 + 919 = 1402 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 550 + 469 = 1018 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 32 × 83 = 2662 right or wrong? (a) Right (b) Wrong

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