Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 300 · 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 966 + 300 = 1265 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 36 × 88 = 3159 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 237 + 875 = 1112 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 31 × 95 = 2945 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 54 × 22 = 1185 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 301 + 351 = 652 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 979 + 899 = 1878 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 82 × 93 = 7619 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 15 × 46 = 690 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 42 × 41 = 1714 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 90 × 42 = 3780 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 49 = 782 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 63 × 30 = 1898 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 14 × 52 = 728 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 34 × 70 = 2380 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 88 × 16 = 1409 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 492 + 345 = 839 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 16 × 79 = 1260 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 804 + 902 = 1706 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 403 + 126 = 533 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 56 × 38 = 2125 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 40 × 92 = 3680 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 75 × 95 = 7125 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 944 + 385 = 1329 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 132 + 349 = 473 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 877 + 704 = 1578 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 654 + 357 = 1011 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 969 + 420 = 1384 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 147 + 962 = 1109 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 53 × 25 = 1328 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 493 + 986 = 1479 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 662 + 163 = 825 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 578 + 146 = 733 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 64 = 1793 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 521 + 503 = 1022 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 301 + 316 = 617 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 801 + 861 = 1662 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 42 × 70 = 2946 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 23 × 20 = 460 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 20 × 33 = 659 right or wrong? (a) Right (b) Wrong

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