Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 989 · 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 65 × 80 = 5200 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 912 + 214 = 1129 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 65 × 78 = 5063 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 49 × 37 = 1804 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 844 + 221 = 1065 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 972 + 912 = 1884 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 93 × 73 = 6789 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 50 × 16 = 800 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 911 + 243 = 1158 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 26 × 43 = 1120 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 14 × 82 = 1144 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 327 + 446 = 779 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 191 + 175 = 366 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 86 × 58 = 4988 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 33 × 73 = 2404 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 91 × 69 = 6279 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 35 = 2068 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 41 × 44 = 1804 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 573 + 399 = 979 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 18 × 36 = 648 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 443 + 814 = 1257 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 607 + 852 = 1468 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 69 × 51 = 3522 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 97 × 16 = 1550 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 92 × 34 = 3128 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 16 × 73 = 1161 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 234 + 299 = 535 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 26 × 20 = 520 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 40 × 52 = 2080 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 46 × 62 = 2855 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 99 × 94 = 9297 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 735 + 388 = 1123 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 98 × 82 = 8036 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 73 × 75 = 5475 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 84 × 91 = 7644 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 540 + 353 = 893 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 12 × 57 = 684 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 387 + 907 = 1303 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 30 × 58 = 1744 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 56 × 25 = 1400 right or wrong? (a) Wrong (b) Right

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