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Maths tricks trick 22: Last-digit detective · Set 899 · 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 800 + 254 = 1054 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 28 × 12 = 336 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 13 × 66 = 858 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 511 + 398 = 916 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 918 + 708 = 1626 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 883 + 395 = 1285 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 40 = 2960 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 57 × 81 = 4617 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 372 + 940 = 1312 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 88 × 82 = 7216 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 611 + 439 = 1048 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 45 × 38 = 1710 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 56 × 47 = 2632 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 675 + 321 = 989 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 347 + 642 = 989 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 73 × 28 = 2048 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 597 + 268 = 861 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 91 × 33 = 3003 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 644 + 264 = 910 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 59 × 36 = 2119 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 13 × 84 = 1090 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 209 + 714 = 924 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 38 = 3154 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 46 × 75 = 3449 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 29 = 1624 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 862 + 271 = 1133 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 86 × 35 = 3010 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 945 + 662 = 1606 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 805 + 266 = 1073 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 827 + 408 = 1235 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 689 + 952 = 1645 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 65 × 12 = 780 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 18 = 701 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 913 + 887 = 1795 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 36 × 93 = 3348 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 206 + 909 = 1115 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 71 × 74 = 5254 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 95 × 45 = 4276 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 88 × 35 = 3080 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 67 × 98 = 6566 right or wrong? (a) Right (b) Wrong

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