Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 448 · 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 61 × 98 = 5983 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 69 × 99 = 6826 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 201 + 732 = 933 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 954 + 834 = 1782 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 95 × 56 = 5315 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 399 + 362 = 754 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 196 + 774 = 976 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 14 × 22 = 307 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 16 × 47 = 752 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 65 × 74 = 4811 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 73 × 14 = 1022 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 73 = 2555 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 472 + 895 = 1371 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 21 × 35 = 737 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 76 × 36 = 2736 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 859 + 782 = 1641 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 39 × 15 = 591 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 864 + 733 = 1604 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 83 × 13 = 1079 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 931 + 107 = 1036 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 96 × 24 = 2304 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 54 × 20 = 1072 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 69 × 97 = 6693 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 66 × 87 = 5743 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 447 + 204 = 655 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 140 + 455 = 596 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 36 × 22 = 792 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 283 + 914 = 1199 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 15 × 78 = 1177 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 64 = 3456 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 34 = 1156 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 60 × 41 = 2454 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 869 + 987 = 1860 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 41 × 59 = 2419 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 53 = 2551 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 504 + 687 = 1191 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 76 × 27 = 2057 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 94 × 80 = 7517 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 66 × 80 = 5280 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 14 = 630 right or wrong? (a) Wrong (b) Right

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