Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 601 · 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 311 + 900 = 1210 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 993 + 909 = 1903 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 71 × 24 = 1704 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 80 × 71 = 5676 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 243 + 742 = 985 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 77 × 44 = 3381 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 56 × 76 = 4255 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 48 × 35 = 1680 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 53 × 24 = 1272 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 56 × 74 = 4138 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 79 × 95 = 7504 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 81 × 37 = 2990 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 55 × 28 = 1540 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 434 + 877 = 1320 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 54 × 53 = 2857 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 75 × 75 = 5625 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 261 + 683 = 941 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 70 × 37 = 2590 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 41 × 87 = 3567 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 62 × 16 = 985 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 51 = 1122 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 375 + 374 = 748 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 312 + 229 = 541 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 451 + 325 = 768 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 13 × 96 = 1253 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 43 × 79 = 3395 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 40 × 35 = 1400 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 479 + 440 = 912 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 21 × 48 = 1008 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 78 × 90 = 7020 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 93 × 65 = 6045 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 43 × 63 = 2709 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 98 × 37 = 3626 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 218 + 481 = 699 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 64 × 96 = 6145 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 34 × 56 = 1907 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 77 = 2550 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 418 + 824 = 1234 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 87 × 84 = 7311 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 59 × 71 = 4188 right or wrong? (a) Wrong (b) Right

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