Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 756 · 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 68 × 68 = 4615 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 425 + 150 = 575 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 387 + 309 = 696 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 364 + 333 = 706 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 575 + 258 = 833 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 485 + 243 = 732 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 80 × 44 = 3520 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 61 × 76 = 4636 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 73 × 74 = 5393 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 70 × 82 = 5740 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 56 × 25 = 1400 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 34 × 67 = 2272 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 85 × 91 = 7735 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 72 × 25 = 1808 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 52 × 41 = 2132 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 390 + 849 = 1242 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 75 × 27 = 2020 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 52 × 94 = 4886 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 222 + 632 = 854 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 442 + 981 = 1423 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 909 + 859 = 1764 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 96 × 47 = 4520 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 17 × 82 = 1394 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 75 × 95 = 7125 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 218 + 901 = 1116 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 147 + 207 = 363 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 87 × 39 = 3393 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 18 × 57 = 1027 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 50 × 76 = 3797 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 91 × 45 = 4094 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 843 + 436 = 1279 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 960 + 479 = 1443 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 91 × 75 = 6816 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 25 × 99 = 2475 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 57 × 23 = 1311 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 659 + 975 = 1634 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 45 × 32 = 1440 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 338 + 524 = 862 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 352 + 539 = 897 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 67 × 76 = 5092 right or wrong? (a) Wrong (b) Right

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