Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 265 · 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 87 × 61 = 5313 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 35 × 82 = 2862 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 67 × 31 = 2077 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 386 + 995 = 1385 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 43 × 87 = 3741 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 20 × 18 = 360 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 19 × 43 = 818 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 816 + 165 = 981 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 77 × 67 = 5159 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 309 + 421 = 730 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 35 × 30 = 1050 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 786 + 727 = 1513 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 212 + 806 = 1018 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 362 + 911 = 1273 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 35 × 31 = 1088 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 335 + 632 = 967 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 875 + 285 = 1155 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 41 × 56 = 2304 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 105 + 259 = 369 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 422 + 513 = 932 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 16 × 90 = 1446 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 70 × 14 = 984 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 28 × 88 = 2459 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 244 + 971 = 1215 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 57 × 82 = 4668 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 62 × 81 = 5022 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 54 × 13 = 702 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 163 + 631 = 794 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 29 × 96 = 2784 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 67 × 80 = 5360 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 166 + 470 = 638 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 299 + 133 = 432 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 119 + 415 = 533 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 52 × 49 = 2548 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 27 × 33 = 897 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 52 × 38 = 1974 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 38 × 63 = 2394 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 77 × 91 = 7007 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 699 + 352 = 1049 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 742 + 237 = 979 right or wrong? (a) Right (b) Wrong

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