Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 854 · 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 809 + 169 = 978 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 98 × 61 = 5978 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 402 + 680 = 1082 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 581 + 304 = 892 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 35 × 61 = 2141 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 31 × 88 = 2728 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 112 + 362 = 481 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 59 × 23 = 1351 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 350 + 181 = 527 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 91 × 78 = 7095 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 334 + 136 = 469 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 575 + 893 = 1468 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 70 × 16 = 1120 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 49 × 70 = 3424 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 60 × 36 = 2160 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 66 × 19 = 1253 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 91 × 80 = 7279 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 24 × 40 = 960 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 38 × 18 = 692 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 28 × 87 = 2431 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 59 × 12 = 699 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 311 + 162 = 475 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 73 × 26 = 1898 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 91 × 20 = 1822 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 886 + 930 = 1816 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 57 × 77 = 4389 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 804 + 544 = 1348 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 71 × 15 = 1070 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 823 + 443 = 1264 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 33 × 26 = 858 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 587 + 105 = 696 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 508 + 194 = 702 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 67 × 31 = 2077 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 67 × 75 = 5025 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 98 × 31 = 3045 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 55 × 98 = 5390 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 28 × 33 = 924 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 24 × 14 = 342 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 357 + 606 = 963 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 516 + 627 = 1145 right or wrong? (a) Right (b) Wrong

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