Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 65 · 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 82 × 16 = 1321 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 63 × 98 = 6173 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 93 = 6229 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 568 + 509 = 1077 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 15 × 70 = 1050 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 45 × 76 = 3427 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 779 + 261 = 1049 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 15 × 96 = 1440 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 725 + 478 = 1203 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 19 × 21 = 399 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 68 × 28 = 1904 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 198 + 445 = 645 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 65 × 71 = 4608 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 45 × 35 = 1575 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 87 × 42 = 3657 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 67 × 38 = 2539 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 68 = 6460 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 74 × 37 = 2738 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 28 × 18 = 504 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 74 × 13 = 962 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 657 + 634 = 1298 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 40 × 55 = 2200 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 40 × 53 = 2120 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 59 × 69 = 4078 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 170 + 170 = 340 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 14 × 30 = 419 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 520 + 924 = 1444 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 97 × 81 = 7850 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 37 × 64 = 2368 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 943 + 501 = 1444 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 41 × 56 = 2296 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 979 + 573 = 1559 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 350 + 704 = 1059 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 75 × 72 = 5400 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 893 + 113 = 1011 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 54 × 86 = 4644 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 497 + 113 = 610 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 32 × 89 = 2841 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 981 + 960 = 1933 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 18 × 24 = 441 right or wrong? (a) Right (b) Wrong

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