Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 256 · 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 719 + 248 = 967 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 79 × 28 = 2213 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 80 × 74 = 5920 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 27 × 95 = 2563 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 68 × 35 = 2389 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 43 × 95 = 4086 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 20 × 43 = 860 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 995 + 884 = 1873 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 737 + 765 = 1502 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 30 × 16 = 480 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 593 + 255 = 848 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 479 + 243 = 722 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 83 × 83 = 6898 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 42 × 58 = 2436 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 299 + 309 = 609 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 371 + 425 = 796 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 59 × 76 = 4478 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 563 + 858 = 1421 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 339 + 764 = 1103 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 48 × 23 = 1105 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 876 + 894 = 1776 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 772 + 123 = 895 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 43 × 19 = 817 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 378 + 566 = 942 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 84 × 76 = 6383 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 847 + 157 = 1004 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 804 + 303 = 1109 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 844 + 180 = 1024 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 95 × 20 = 1900 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 61 × 53 = 3227 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 711 + 772 = 1483 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 559 + 202 = 753 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 18 × 80 = 1440 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 613 + 383 = 1000 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 25 × 60 = 1500 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 22 × 16 = 353 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 29 × 59 = 1711 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 42 × 67 = 2812 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 431 + 320 = 742 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 47 × 33 = 1558 right or wrong? (a) Wrong (b) Right

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