Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 461 · 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 90 × 76 = 6842 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 31 × 98 = 3038 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 952 + 898 = 1850 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 15 × 25 = 373 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 47 × 47 = 2209 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 80 × 41 = 3280 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 390 + 984 = 1375 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 312 + 940 = 1252 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 816 + 777 = 1586 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 245 + 359 = 607 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 26 × 62 = 1615 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 868 + 954 = 1822 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 15 × 27 = 405 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 653 + 223 = 876 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 754 + 760 = 1514 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 751 + 978 = 1735 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 471 + 688 = 1159 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 769 + 912 = 1681 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 66 × 58 = 3828 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 777 + 476 = 1253 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 789 + 581 = 1371 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 49 × 17 = 833 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 39 × 13 = 507 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 93 × 37 = 3449 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 988 + 935 = 1923 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 756 + 793 = 1549 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 73 × 15 = 1096 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 294 + 967 = 1257 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 212 + 197 = 409 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 48 × 33 = 1584 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 176 + 158 = 334 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 870 + 664 = 1534 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 63 × 89 = 5612 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 47 × 46 = 2155 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 30 × 31 = 922 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 43 × 15 = 645 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 76 × 64 = 4864 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 41 × 87 = 3567 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 76 × 82 = 6226 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 335 + 310 = 652 right or wrong? (a) Right (b) Wrong

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