Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 957 · 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 572 + 276 = 850 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 34 × 34 = 1156 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 25 × 36 = 892 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 891 + 920 = 1807 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 95 × 74 = 7036 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 682 + 435 = 1113 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 42 × 31 = 1298 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 73 × 46 = 3358 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 27 × 37 = 994 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 29 × 74 = 2146 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 66 × 75 = 4950 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 252 + 405 = 664 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 20 × 15 = 300 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 99 × 29 = 2878 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 71 × 32 = 2270 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 60 × 97 = 5820 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 21 × 83 = 1743 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 40 × 34 = 1356 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 637 + 849 = 1487 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 39 × 99 = 3860 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 71 × 23 = 1633 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 620 + 365 = 994 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 30 × 90 = 2700 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 108 + 939 = 1049 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 717 + 905 = 1622 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 864 + 720 = 1593 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 43 × 81 = 3486 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 62 × 55 = 3407 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 150 + 711 = 861 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 15 × 64 = 957 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 31 × 58 = 1798 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 268 + 291 = 559 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 26 × 57 = 1475 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 49 × 34 = 1664 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 973 + 245 = 1218 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 51 × 53 = 2703 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 14 × 18 = 252 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 85 × 25 = 2125 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 25 × 92 = 2300 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 960 + 355 = 1315 right or wrong? (a) Right (b) Wrong

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