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Maths tricks trick 22: Last-digit detective · Set 508 · 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 936 + 150 = 1091 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 165 + 221 = 381 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 150 + 610 = 760 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 97 × 34 = 3294 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 74 × 76 = 5624 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 27 × 67 = 1809 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 738 + 116 = 863 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 74 × 73 = 5396 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 71 × 75 = 5325 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 67 × 24 = 1608 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 325 + 972 = 1288 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 24 × 20 = 473 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 184 + 514 = 698 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 78 × 28 = 2190 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 61 × 46 = 2811 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 369 + 490 = 859 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 598 + 778 = 1376 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 21 × 21 = 437 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 554 + 672 = 1228 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 99 × 99 = 9801 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 154 + 990 = 1144 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 96 × 70 = 6720 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 31 × 26 = 804 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 93 × 23 = 2139 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 18 × 22 = 395 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 67 × 93 = 6225 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 24 × 74 = 1772 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 76 × 16 = 1207 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 564 + 887 = 1451 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 79 × 32 = 2528 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 692 + 260 = 952 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 80 × 66 = 5285 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 965 + 662 = 1626 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 575 + 330 = 914 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 240 + 961 = 1206 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 967 + 766 = 1725 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 129 + 582 = 711 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 66 × 25 = 1644 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 18 × 23 = 411 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 146 + 611 = 762 right or wrong? (a) Wrong (b) Right

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