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Maths tricks trick 22: Last-digit detective · Set 476 · 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 597 + 265 = 862 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 160 + 481 = 641 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 280 + 879 = 1159 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 684 + 233 = 915 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 922 + 724 = 1644 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 679 + 121 = 807 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 324 + 344 = 675 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 39 × 31 = 1209 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 420 + 979 = 1399 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 28 × 39 = 1092 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 953 + 705 = 1658 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 810 + 917 = 1728 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 447 + 756 = 1203 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 20 × 51 = 1024 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 255 + 690 = 945 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 665 + 120 = 785 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 18 × 93 = 1665 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 12 × 73 = 870 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 99 × 28 = 2772 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 693 + 666 = 1353 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 51 = 1581 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 273 + 792 = 1060 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 856 + 944 = 1800 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 81 × 56 = 4542 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 687 + 797 = 1484 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 888 + 265 = 1160 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 697 + 637 = 1341 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 230 + 346 = 583 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 878 + 170 = 1048 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 56 × 20 = 1120 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 147 + 236 = 383 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 50 × 20 = 1000 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 288 + 189 = 477 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 49 × 56 = 2744 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 826 + 281 = 1107 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 350 + 371 = 721 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 59 × 30 = 1770 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 623 + 842 = 1459 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 950 + 688 = 1640 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 42 × 42 = 1764 right or wrong? (a) Wrong (b) Right

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