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Maths tricks trick 22: Last-digit detective · Set 772 · 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 82 × 24 = 1968 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 82 × 14 = 1148 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 539 + 255 = 792 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 88 × 75 = 6602 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 45 × 16 = 724 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 406 + 684 = 1090 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 45 × 68 = 3069 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 94 × 76 = 7144 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 45 × 90 = 4050 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 891 + 202 = 1093 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 30 × 80 = 2408 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 60 × 31 = 1860 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 98 × 64 = 6272 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 87 × 68 = 5916 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 723 + 950 = 1673 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 57 × 78 = 4446 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 30 × 39 = 1170 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 256 + 135 = 382 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 614 + 310 = 924 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 96 × 16 = 1536 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 82 × 43 = 3526 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 13 = 949 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 760 + 742 = 1502 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 778 + 563 = 1341 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 130 + 258 = 396 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 37 × 14 = 514 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 116 + 518 = 634 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 899 + 567 = 1466 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 902 + 928 = 1827 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 442 + 694 = 1140 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 208 + 940 = 1139 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 462 + 902 = 1364 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 344 + 867 = 1211 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 677 + 965 = 1647 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 621 + 981 = 1602 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 991 + 703 = 1694 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 70 × 71 = 4961 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 45 × 93 = 4185 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 596 + 735 = 1336 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 76 × 50 = 3795 right or wrong? (a) Wrong (b) Right

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