Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 660 · 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 62 × 33 = 2046 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 38 × 61 = 2320 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 665 + 251 = 916 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 702 + 734 = 1436 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 957 + 908 = 1858 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 38 × 70 = 2660 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 59 × 16 = 936 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 306 + 239 = 545 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 89 × 21 = 1869 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 530 + 792 = 1318 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 67 × 93 = 6231 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 377 + 158 = 535 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 80 × 50 = 4000 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 89 × 79 = 7031 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 991 + 736 = 1727 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 135 + 532 = 667 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 173 + 816 = 993 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 835 + 833 = 1668 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 87 × 48 = 4173 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 419 + 617 = 1035 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 947 + 952 = 1901 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 48 × 23 = 1108 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 87 × 13 = 1136 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 236 + 338 = 574 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 491 + 298 = 793 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 26 × 49 = 1265 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 833 + 692 = 1521 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 880 + 923 = 1794 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 93 × 49 = 4563 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 362 + 484 = 848 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 60 × 67 = 4020 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 24 = 672 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 26 × 37 = 969 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 14 × 62 = 864 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 73 × 56 = 4092 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 558 + 841 = 1399 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 61 × 85 = 5185 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 49 × 67 = 3283 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 67 × 72 = 4833 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 43 × 39 = 1674 right or wrong? (a) Wrong (b) Right

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