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Maths tricks trick 22: Last-digit detective · Set 559 · 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 38 × 47 = 1782 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 37 × 75 = 2770 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 37 × 72 = 2664 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 342 + 230 = 572 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 149 + 113 = 262 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 20 × 18 = 360 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 505 + 878 = 1385 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 302 + 113 = 423 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 89 × 97 = 8633 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 642 + 903 = 1545 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 57 × 85 = 4840 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 257 + 496 = 755 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 91 × 69 = 6279 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 221 + 350 = 563 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 45 × 47 = 2114 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 58 × 30 = 1740 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 247 + 611 = 854 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 84 × 32 = 2693 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 735 + 231 = 959 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 858 + 803 = 1661 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 470 + 808 = 1278 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 77 × 66 = 5082 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 469 + 647 = 1116 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 35 = 2065 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 21 × 99 = 2083 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 736 + 770 = 1501 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 47 = 3328 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 76 × 32 = 2432 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 77 × 99 = 7623 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 979 + 874 = 1853 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 645 + 225 = 866 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 69 × 60 = 4140 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 662 + 729 = 1395 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 938 + 764 = 1703 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 81 × 18 = 1460 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 890 + 930 = 1820 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 36 × 43 = 1539 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 59 × 21 = 1239 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 15 × 15 = 225 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 708 + 931 = 1639 right or wrong? (a) Right (b) Wrong

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