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Maths tricks trick 22: Last-digit detective · Set 530 · 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 97 × 82 = 7954 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 31 × 27 = 837 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 416 + 824 = 1240 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 341 + 932 = 1269 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 78 × 63 = 4914 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 497 + 958 = 1455 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 55 × 91 = 5011 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 575 + 259 = 825 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 35 × 43 = 1499 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 899 + 111 = 1015 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 541 + 365 = 908 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 165 + 569 = 740 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 78 × 20 = 1567 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 98 × 43 = 4214 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 94 × 42 = 3955 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 464 + 829 = 1292 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 82 × 85 = 6961 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 643 + 214 = 866 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 91 × 57 = 5187 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 56 × 69 = 3864 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 83 × 47 = 3901 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 534 + 678 = 1220 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 23 = 299 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 23 × 99 = 2273 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 83 × 99 = 8220 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 841 + 984 = 1825 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 395 + 460 = 855 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 665 + 742 = 1407 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 963 + 641 = 1604 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 36 × 28 = 1008 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 46 × 82 = 3777 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 222 + 730 = 952 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 75 × 91 = 6818 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 852 + 177 = 1029 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 12 = 714 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 184 + 714 = 898 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 21 × 93 = 1950 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 709 + 128 = 832 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 34 = 1258 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 149 + 893 = 1040 right or wrong? (a) Right (b) Wrong

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