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Maths tricks trick 22: Last-digit detective · Set 489 · 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 99 × 65 = 6435 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 30 × 93 = 2790 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 840 + 727 = 1566 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 682 + 334 = 1013 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 700 + 300 = 997 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 52 × 51 = 2652 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 97 × 67 = 6499 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 652 + 972 = 1624 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 28 × 28 = 784 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 897 + 327 = 1228 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 94 = 9118 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 96 × 52 = 4992 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 97 × 79 = 7671 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 15 × 34 = 510 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 91 × 78 = 7098 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 148 + 717 = 865 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 56 × 39 = 2184 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 79 × 77 = 6083 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 91 × 52 = 4732 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 142 + 996 = 1137 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 482 + 338 = 818 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 856 + 118 = 972 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 18 × 89 = 1602 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 526 + 605 = 1131 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 52 × 23 = 1196 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 832 + 421 = 1253 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 70 × 52 = 3642 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 36 × 41 = 1476 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 964 + 627 = 1596 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 602 + 733 = 1327 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 73 × 16 = 1168 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 883 + 709 = 1587 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 794 + 707 = 1501 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 927 + 697 = 1624 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 68 × 21 = 1429 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 734 + 439 = 1173 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 59 × 48 = 2832 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 90 = 1437 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 570 + 311 = 881 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 42 × 31 = 1311 right or wrong? (a) Wrong (b) Right

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