Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 474 · 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 544 + 905 = 1449 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 621 + 374 = 995 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 168 + 561 = 734 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 133 + 736 = 869 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 96 × 50 = 4800 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 539 + 542 = 1081 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 301 + 700 = 1001 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 49 × 36 = 1771 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 359 + 671 = 1030 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 653 + 297 = 952 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 66 × 49 = 3241 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 853 + 748 = 1601 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 21 × 24 = 501 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 778 + 321 = 1099 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 371 + 333 = 704 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 17 × 60 = 1012 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 50 × 95 = 4745 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 30 × 72 = 2152 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 82 × 75 = 6150 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 30 × 12 = 360 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 451 + 280 = 729 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 44 × 36 = 1584 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 938 + 617 = 1555 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 14 × 81 = 1134 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 79 × 34 = 2685 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 80 × 57 = 4557 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 182 + 705 = 880 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 65 × 97 = 6305 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 206 + 404 = 617 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 41 × 45 = 1853 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 36 × 75 = 2693 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 35 × 77 = 2702 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 280 + 332 = 612 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 93 × 91 = 8463 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 823 + 371 = 1189 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 547 + 185 = 732 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 43 × 28 = 1204 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 144 + 128 = 278 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 57 × 67 = 3819 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 34 × 47 = 1598 right or wrong? (a) Wrong (b) Right

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