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Maths tricks trick 22: Last-digit detective · Set 587 · 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 466 + 720 = 1186 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 857 + 143 = 1000 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 788 + 382 = 1170 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 63 × 38 = 2394 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 67 × 43 = 2881 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 46 × 79 = 3642 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 412 + 736 = 1148 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 71 × 21 = 1498 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 31 × 30 = 930 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 907 + 300 = 1205 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 801 + 588 = 1396 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 374 + 229 = 603 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 167 + 982 = 1146 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 47 × 64 = 3004 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 563 + 658 = 1212 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 60 × 75 = 4501 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 748 + 554 = 1302 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 21 × 86 = 1806 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 747 + 595 = 1338 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 31 × 87 = 2689 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 964 + 511 = 1475 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 62 × 96 = 5944 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 755 + 628 = 1383 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 78 × 41 = 3206 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 24 × 42 = 1008 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 78 × 76 = 5932 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 135 + 224 = 359 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 59 × 30 = 1770 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 36 × 68 = 2448 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 599 + 161 = 760 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 534 + 564 = 1098 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 29 × 62 = 1798 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 546 + 566 = 1112 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 780 + 692 = 1478 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 751 + 990 = 1741 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 760 + 135 = 895 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 585 + 906 = 1485 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 126 + 230 = 356 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 711 + 630 = 1341 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 29 × 87 = 2523 right or wrong? (a) Right (b) Wrong

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