Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 679 · 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 70 × 68 = 4760 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 51 × 74 = 3782 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 57 × 46 = 2630 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 735 + 175 = 910 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 12 × 58 = 697 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 24 × 35 = 837 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 226 + 158 = 384 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 875 + 692 = 1576 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 30 × 29 = 870 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 84 × 22 = 1855 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 80 × 34 = 2720 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 51 × 40 = 2040 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 70 × 41 = 2870 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 26 × 39 = 1014 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 81 × 59 = 4775 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 60 × 15 = 900 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 33 × 59 = 1946 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 175 + 243 = 418 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 961 + 547 = 1507 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 974 + 939 = 1908 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 64 × 21 = 1349 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 13 × 94 = 1222 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 35 × 72 = 2511 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 28 × 74 = 2072 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 606 + 189 = 795 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 78 × 94 = 7332 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 322 + 362 = 690 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 74 × 17 = 1267 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 266 + 275 = 548 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 760 + 374 = 1128 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 843 + 352 = 1192 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 924 + 829 = 1754 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 637 + 940 = 1585 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 803 + 833 = 1636 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 26 = 2292 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 806 + 496 = 1302 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 64 × 87 = 5568 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 66 × 39 = 2583 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 42 × 31 = 1302 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 94 × 71 = 6682 right or wrong? (a) Right (b) Wrong

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