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Maths tricks trick 22: Last-digit detective · Set 289 · 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 623 + 816 = 1439 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 177 + 829 = 1006 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 80 × 96 = 7680 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 648 + 677 = 1325 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 41 × 70 = 2870 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 241 + 683 = 924 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 183 + 343 = 526 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 17 × 78 = 1326 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 80 × 44 = 3518 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 514 + 998 = 1512 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 93 × 26 = 2415 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 44 × 48 = 2112 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 95 × 27 = 2565 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 39 × 47 = 1831 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 353 + 550 = 903 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 359 + 954 = 1313 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 37 × 37 = 1377 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 258 + 399 = 661 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 250 + 318 = 563 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 64 × 95 = 6079 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 678 + 747 = 1418 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 82 × 60 = 4913 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 37 × 31 = 1147 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 43 × 56 = 2411 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 499 + 685 = 1184 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 34 × 23 = 782 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 76 × 64 = 4865 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 45 × 67 = 3015 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 395 + 327 = 723 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 678 + 192 = 877 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 709 + 965 = 1674 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 675 + 235 = 910 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 693 + 974 = 1667 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 874 + 400 = 1282 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 64 × 25 = 1600 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 421 + 844 = 1265 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 896 + 243 = 1147 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 33 × 54 = 1791 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 575 + 578 = 1149 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 772 + 969 = 1741 right or wrong? (a) Right (b) Wrong

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