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Maths tricks trick 22: Last-digit detective · Set 371 · 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 59 × 12 = 715 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 649 + 239 = 893 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 53 × 50 = 2650 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 64 × 78 = 4993 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 78 × 42 = 3276 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 759 + 903 = 1662 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 891 + 651 = 1542 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 257 + 274 = 536 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 769 + 618 = 1385 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 889 + 557 = 1449 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 748 + 325 = 1073 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 96 × 37 = 3546 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 200 + 627 = 827 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 83 × 41 = 3401 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 292 + 913 = 1210 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 593 + 781 = 1365 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 150 + 722 = 877 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 265 + 723 = 988 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 51 × 90 = 4590 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 29 × 62 = 1798 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 29 × 63 = 1827 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 73 × 26 = 1898 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 147 + 830 = 978 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 86 × 26 = 2227 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 93 × 72 = 6701 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 110 + 299 = 409 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 949 + 396 = 1345 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 244 + 335 = 583 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 520 + 138 = 659 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 65 × 36 = 2331 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 27 × 30 = 810 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 36 × 95 = 3420 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 670 + 728 = 1390 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 971 + 668 = 1645 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 45 × 17 = 765 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 44 × 26 = 1152 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 97 × 43 = 4169 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 19 × 18 = 343 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 469 + 759 = 1220 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 958 + 539 = 1504 right or wrong? (a) Right (b) Wrong

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