Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 770 · 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 52 × 51 = 2652 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 75 × 65 = 4881 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 538 + 527 = 1069 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 316 + 316 = 636 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 327 + 802 = 1124 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 23 × 95 = 2185 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 58 × 84 = 4873 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 85 × 53 = 4505 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 485 + 576 = 1061 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 203 + 697 = 900 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 425 + 277 = 700 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 92 × 93 = 8565 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 96 × 80 = 7680 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 978 + 799 = 1779 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 835 + 560 = 1390 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 13 × 68 = 884 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 69 × 42 = 2890 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 256 + 133 = 394 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 54 × 74 = 3996 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 121 + 446 = 567 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 25 × 78 = 1947 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 479 + 359 = 835 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 38 × 49 = 1854 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 51 × 96 = 4887 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 70 × 44 = 3080 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 67 × 63 = 4221 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 800 + 667 = 1467 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 311 + 474 = 780 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 421 + 166 = 588 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 15 × 24 = 364 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 35 × 94 = 3290 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 31 × 26 = 803 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 48 × 23 = 1097 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 71 × 54 = 3834 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 745 + 179 = 924 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 21 × 18 = 378 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 92 × 85 = 7826 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 650 + 940 = 1599 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 814 + 970 = 1784 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 57 × 43 = 2451 right or wrong? (a) Right (b) Wrong

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