Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 452 · 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 38 × 86 = 3268 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 23 × 35 = 796 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 82 × 95 = 7781 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 62 × 91 = 5642 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 376 + 965 = 1341 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 677 + 290 = 972 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 91 × 50 = 4556 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 29 × 21 = 602 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 86 × 57 = 4901 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 59 × 95 = 5605 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 36 × 70 = 2522 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 75 × 95 = 7125 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 13 × 36 = 464 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 35 × 86 = 3009 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 584 + 951 = 1539 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 466 + 393 = 859 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 702 + 704 = 1406 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 63 × 94 = 5922 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 875 + 530 = 1399 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 513 + 124 = 637 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 788 + 157 = 937 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 79 × 55 = 4347 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 79 × 60 = 4740 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 82 × 13 = 1063 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 124 + 874 = 991 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 679 + 883 = 1562 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 76 × 44 = 3347 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 967 + 171 = 1147 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 450 + 970 = 1414 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 58 × 77 = 4466 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 93 × 12 = 1113 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 122 + 982 = 1104 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 19 × 47 = 893 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 64 × 29 = 1853 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 634 + 190 = 830 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 18 × 85 = 1530 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 62 × 65 = 4036 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 19 × 96 = 1830 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 149 + 988 = 1137 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 54 × 77 = 4158 right or wrong? (a) Right (b) Wrong

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