Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 965 · 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 956 + 180 = 1135 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 387 + 412 = 799 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 92 × 26 = 2392 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 25 × 39 = 975 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 713 + 333 = 1046 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 843 + 393 = 1236 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 855 + 497 = 1352 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 45 × 75 = 3375 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 226 + 625 = 851 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 53 × 78 = 4142 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 25 × 80 = 1999 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 42 × 25 = 1049 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 50 × 67 = 3350 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 44 × 25 = 1096 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 417 + 687 = 1108 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 521 + 996 = 1520 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 28 × 50 = 1404 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 80 × 81 = 6480 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 13 × 26 = 338 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 756 + 782 = 1538 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 94 = 2916 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 184 + 337 = 521 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 471 + 124 = 595 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 47 × 40 = 1880 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 855 + 168 = 1026 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 186 + 613 = 799 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 60 × 80 = 4800 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 397 + 325 = 722 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 172 + 984 = 1156 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 645 + 139 = 785 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 95 = 1995 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 74 × 31 = 2294 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 522 + 786 = 1308 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 779 + 861 = 1640 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 637 + 623 = 1260 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 52 × 64 = 3328 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 150 + 562 = 710 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 118 + 661 = 779 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 17 × 28 = 481 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 19 × 61 = 1159 right or wrong? (a) Right (b) Wrong

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