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Maths tricks trick 22: Last-digit detective · Set 543 · 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 53 × 43 = 2273 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 826 + 774 = 1601 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 79 × 34 = 2682 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 33 × 65 = 2138 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 43 × 87 = 3741 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 88 × 19 = 1672 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 65 × 77 = 5014 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 78 × 92 = 7170 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 411 + 784 = 1186 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 644 + 705 = 1349 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 25 = 2078 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 75 × 62 = 4650 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 484 + 788 = 1273 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 81 × 36 = 2916 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 82 × 60 = 4920 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 611 + 124 = 735 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 50 × 95 = 4750 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 722 + 293 = 1019 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 722 + 211 = 925 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 82 × 19 = 1558 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 495 + 626 = 1112 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 443 + 983 = 1430 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 15 × 85 = 1274 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 835 + 321 = 1156 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 889 + 643 = 1532 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 16 × 77 = 1231 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 968 + 964 = 1932 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 975 + 183 = 1156 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 82 = 3286 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 218 + 167 = 385 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 45 × 91 = 4089 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 26 × 89 = 2320 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 894 + 242 = 1145 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 382 + 277 = 655 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 30 × 62 = 1860 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 58 × 40 = 2320 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 796 + 270 = 1066 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 94 × 12 = 1134 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 81 × 18 = 1450 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 891 + 218 = 1109 right or wrong? (a) Wrong (b) Right

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