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Maths tricks trick 22: Last-digit detective · Set 495 · 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 40 × 46 = 1845 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 53 × 37 = 1966 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 730 + 336 = 1066 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 227 + 981 = 1208 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 28 × 44 = 1232 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 87 × 67 = 5829 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 238 + 599 = 837 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 21 × 53 = 1104 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 119 + 334 = 453 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 32 × 99 = 3168 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 676 + 942 = 1618 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 582 + 536 = 1121 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 817 + 834 = 1660 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 86 × 29 = 2494 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 51 × 94 = 4794 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 878 + 251 = 1129 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 44 × 18 = 792 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 50 × 79 = 3950 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 347 + 150 = 497 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 14 × 74 = 1027 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 885 + 480 = 1365 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 114 + 662 = 776 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 236 + 987 = 1223 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 301 + 438 = 732 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 553 + 784 = 1337 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 627 + 981 = 1612 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 20 × 81 = 1615 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 547 + 817 = 1364 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 21 = 546 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 62 × 59 = 3659 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 37 × 76 = 2804 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 199 + 449 = 648 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 48 × 47 = 2253 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 78 × 13 = 1014 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 658 + 989 = 1647 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 848 + 916 = 1766 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 56 × 91 = 5094 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 44 × 59 = 2596 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 277 + 268 = 545 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 38 × 49 = 1859 right or wrong? (a) Wrong (b) Right

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