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Maths tricks trick 22: Last-digit detective · Set 331 · 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 73 × 31 = 2263 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 528 + 793 = 1321 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 95 × 36 = 3420 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 97 × 61 = 5917 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 859 + 667 = 1526 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 26 × 85 = 2218 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 340 + 878 = 1218 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 956 + 265 = 1221 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 961 + 213 = 1174 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 52 × 85 = 4420 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 184 + 531 = 715 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 205 + 449 = 663 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 759 + 580 = 1339 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 76 × 97 = 7372 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 882 + 756 = 1638 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 14 × 66 = 924 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 785 + 627 = 1419 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 95 × 28 = 2662 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 574 + 212 = 793 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 63 × 45 = 2835 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 89 × 29 = 2581 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 232 + 166 = 399 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 723 + 538 = 1256 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 40 × 81 = 3237 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 66 × 15 = 990 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 990 + 946 = 1936 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 15 × 76 = 1140 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 27 × 28 = 756 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 148 + 221 = 369 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 260 + 863 = 1123 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 638 + 794 = 1432 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 255 + 998 = 1256 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 73 × 38 = 2777 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 952 + 223 = 1175 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 50 × 62 = 3100 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 23 × 60 = 1380 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 48 × 53 = 2544 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 687 + 555 = 1242 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 64 × 70 = 4480 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 33 × 76 = 2505 right or wrong? (a) Wrong (b) Right

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