Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 985 · 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 14 × 72 = 1008 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 274 + 842 = 1108 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 56 × 39 = 2182 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 29 × 74 = 2155 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 534 + 985 = 1521 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 784 + 709 = 1493 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 801 + 914 = 1724 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 16 × 41 = 656 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 55 × 77 = 4231 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 91 × 87 = 7917 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 70 × 74 = 5180 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 61 × 89 = 5423 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 474 + 988 = 1462 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 756 + 699 = 1455 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 223 + 132 = 355 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 23 × 57 = 1311 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 88 × 39 = 3423 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 136 + 268 = 404 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 29 × 58 = 1682 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 99 × 73 = 7227 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 824 + 279 = 1100 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 567 + 118 = 692 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 85 × 85 = 7223 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 64 × 21 = 1353 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 65 × 78 = 5068 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 900 + 366 = 1266 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 71 = 6883 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 99 × 90 = 8909 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 51 × 43 = 2186 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 44 × 22 = 966 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 64 × 96 = 6136 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 22 × 15 = 330 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 48 × 33 = 1592 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 72 × 86 = 6191 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 62 × 40 = 2479 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 55 × 38 = 2090 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 90 = 3151 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 789 + 818 = 1616 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 321 + 664 = 985 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 23 × 49 = 1127 right or wrong? (a) Wrong (b) Right

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