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Maths tricks trick 22: Last-digit detective · Set 231 · 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 814 + 935 = 1746 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 793 + 193 = 986 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 68 × 25 = 1700 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 245 + 460 = 705 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 707 + 159 = 866 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 912 + 724 = 1636 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 360 + 333 = 693 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 754 + 937 = 1689 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 621 + 555 = 1176 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 33 × 35 = 1158 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 405 + 623 = 1028 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 883 + 814 = 1697 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 45 × 15 = 678 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 324 + 830 = 1160 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 960 + 768 = 1723 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 452 + 989 = 1441 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 219 + 247 = 464 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 420 + 651 = 1068 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 870 + 616 = 1485 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 15 × 92 = 1380 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 47 × 90 = 4230 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 969 + 286 = 1249 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 633 + 398 = 1033 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 79 × 65 = 5129 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 754 + 909 = 1663 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 75 × 62 = 4653 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 48 × 60 = 2880 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 341 + 914 = 1255 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 26 × 74 = 1933 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 348 + 262 = 612 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 53 × 54 = 2864 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 15 × 71 = 1065 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 466 + 921 = 1390 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 327 + 617 = 944 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 40 × 77 = 3080 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 644 + 441 = 1083 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 442 + 430 = 872 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 925 + 539 = 1461 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 866 + 555 = 1418 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 420 + 670 = 1090 right or wrong? (a) Wrong (b) Right

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