Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 549 · 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 36 × 93 = 3348 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 920 + 393 = 1313 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 663 + 908 = 1577 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 37 × 13 = 474 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 67 × 25 = 1671 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 525 + 853 = 1379 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 749 + 133 = 882 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 19 × 19 = 361 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 349 + 856 = 1205 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 84 × 79 = 6636 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 96 × 12 = 1157 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 328 + 406 = 735 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 28 × 42 = 1176 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 151 + 258 = 409 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 77 × 76 = 5852 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 340 + 169 = 509 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 208 + 165 = 364 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 798 + 200 = 1003 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 20 × 48 = 960 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 164 + 390 = 554 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 54 × 99 = 5338 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 624 + 833 = 1457 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 555 + 410 = 961 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 13 × 31 = 400 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 15 × 39 = 585 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 83 × 90 = 7470 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 19 × 17 = 318 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 842 + 300 = 1142 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 79 × 42 = 3318 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 20 × 63 = 1256 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 18 × 34 = 612 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 81 × 80 = 6479 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 18 × 62 = 1116 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 95 × 41 = 3895 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 15 × 82 = 1223 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 21 × 99 = 2087 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 813 + 395 = 1211 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 648 + 313 = 961 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 19 × 82 = 1552 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 85 × 76 = 6461 right or wrong? (a) Wrong (b) Right

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