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Maths tricks trick 22: Last-digit detective · Set 298 · 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 243 + 689 = 932 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 81 × 71 = 5751 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 416 + 214 = 630 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 45 × 46 = 2070 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 615 + 500 = 1117 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 518 + 790 = 1308 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 483 + 560 = 1042 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 57 × 49 = 2795 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 19 × 18 = 344 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 787 + 991 = 1774 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 123 + 214 = 337 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 324 + 970 = 1294 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 969 + 878 = 1847 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 574 + 114 = 688 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 336 + 274 = 610 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 655 + 115 = 771 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 860 + 818 = 1679 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 488 + 438 = 926 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 405 + 224 = 629 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 990 + 218 = 1203 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 36 × 15 = 537 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 91 × 18 = 1638 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 82 × 54 = 4428 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 62 × 23 = 1419 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 143 + 648 = 798 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 72 × 27 = 1944 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 419 + 888 = 1309 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 930 + 203 = 1133 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 70 × 37 = 2590 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 28 × 96 = 2684 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 800 + 202 = 1002 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 23 × 95 = 2185 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 385 + 694 = 1080 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 14 × 68 = 952 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 31 × 17 = 527 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 62 × 89 = 5518 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 95 × 84 = 7971 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 41 × 30 = 1230 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 941 + 494 = 1435 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 241 + 823 = 1064 right or wrong? (a) Right (b) Wrong

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