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Maths tricks trick 22: Last-digit detective · Set 465 · 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 618 + 124 = 742 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 67 × 33 = 2212 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 36 × 69 = 2481 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 991 + 973 = 1959 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 60 × 83 = 4980 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 909 + 939 = 1848 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 899 + 494 = 1393 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 793 + 484 = 1274 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 81 × 64 = 5184 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 27 × 80 = 2158 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 17 = 1646 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 715 + 216 = 925 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 812 + 748 = 1560 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 412 + 203 = 609 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 425 + 251 = 673 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 697 + 822 = 1513 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 57 × 44 = 2515 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 728 + 906 = 1632 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 808 + 647 = 1457 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 879 + 139 = 1021 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 41 × 70 = 2861 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 12 × 39 = 468 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 255 + 258 = 512 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 607 + 802 = 1409 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 64 × 21 = 1344 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 788 + 629 = 1408 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 839 + 908 = 1747 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 62 × 95 = 5890 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 85 × 25 = 2125 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 44 × 78 = 3432 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 426 + 431 = 854 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 642 + 181 = 818 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 280 + 475 = 755 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 951 + 403 = 1350 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 148 + 837 = 985 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 80 × 61 = 4880 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 31 = 2015 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 30 × 27 = 810 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 537 + 263 = 806 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 606 + 433 = 1035 right or wrong? (a) Wrong (b) Right

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