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Maths tricks trick 22: Last-digit detective · Set 510 · 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 196 + 912 = 1106 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 41 × 49 = 2009 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 77 × 44 = 3388 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 40 × 19 = 756 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 991 + 186 = 1177 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 62 × 82 = 5075 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 36 × 86 = 3096 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 821 + 860 = 1677 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 223 + 124 = 347 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 200 + 758 = 959 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 919 + 851 = 1770 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 164 + 388 = 552 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 12 × 26 = 312 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 236 + 179 = 415 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 36 × 13 = 468 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 470 + 432 = 893 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 107 + 160 = 266 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 48 × 97 = 4655 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 608 + 734 = 1342 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 94 × 28 = 2636 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 194 + 610 = 807 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 331 + 222 = 547 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 114 + 928 = 1050 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 70 × 61 = 4264 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 38 × 27 = 1026 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 56 = 4256 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 40 × 26 = 1043 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 484 + 610 = 1094 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 38 × 38 = 1444 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 277 + 882 = 1159 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 204 + 777 = 981 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 28 × 89 = 2492 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 43 × 54 = 2326 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 24 × 95 = 2281 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 307 + 493 = 802 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 986 + 511 = 1497 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 81 × 88 = 7128 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 424 + 165 = 583 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 152 + 977 = 1128 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 414 + 445 = 864 right or wrong? (a) Right (b) Wrong

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