Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 680 · 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 909 + 237 = 1149 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 49 × 36 = 1764 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 120 + 636 = 756 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 98 × 67 = 6559 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 697 + 144 = 841 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 62 × 35 = 2170 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 86 × 12 = 1032 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 40 × 24 = 962 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 45 × 98 = 4417 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 142 + 490 = 639 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 23 × 28 = 648 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 888 + 962 = 1859 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 434 + 165 = 599 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 40 × 27 = 1080 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 32 = 384 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 56 × 30 = 1688 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 60 × 81 = 4860 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 43 × 44 = 1892 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 22 × 53 = 1166 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 160 + 621 = 785 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 29 × 51 = 1485 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 52 × 13 = 669 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 856 + 330 = 1192 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 794 + 684 = 1472 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 590 + 440 = 1028 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 122 + 262 = 384 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 393 + 441 = 834 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 728 + 716 = 1444 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 232 + 860 = 1092 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 95 × 23 = 2185 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 83 × 35 = 2905 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 35 × 96 = 3352 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 870 + 596 = 1462 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 742 + 156 = 898 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 957 + 546 = 1503 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 31 × 74 = 2289 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 751 + 984 = 1744 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 35 × 57 = 1995 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 13 × 47 = 611 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 256 + 294 = 550 right or wrong? (a) Right (b) Wrong

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