Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 127 · 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 977 + 824 = 1801 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 23 × 64 = 1472 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 30 × 71 = 2137 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 930 + 377 = 1298 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 44 × 12 = 528 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 35 × 50 = 1750 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 34 × 97 = 3291 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 912 + 682 = 1594 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 882 + 858 = 1742 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 30 × 81 = 2429 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 55 × 26 = 1430 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 192 + 924 = 1119 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 716 + 399 = 1115 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 73 × 92 = 6716 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 91 × 51 = 4641 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 95 × 23 = 2180 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 63 × 90 = 5670 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 998 + 678 = 1683 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 82 × 59 = 4838 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 35 × 16 = 551 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 484 + 215 = 692 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 856 + 868 = 1724 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 371 + 500 = 876 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 65 × 65 = 4225 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 88 × 33 = 2905 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 58 × 60 = 3480 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 52 × 30 = 1560 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 61 × 20 = 1220 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 691 + 108 = 799 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 40 × 25 = 1003 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 48 × 54 = 2592 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 760 + 135 = 888 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 96 × 28 = 2688 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 67 × 42 = 2818 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 490 + 729 = 1226 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 71 × 93 = 6608 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 91 × 18 = 1638 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 863 + 435 = 1306 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 924 + 578 = 1494 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 57 × 85 = 4845 right or wrong? (a) Right (b) Wrong

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