Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 283 · 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 66 × 26 = 1716 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 113 + 113 = 226 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 526 + 734 = 1254 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 50 × 47 = 2358 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 51 × 45 = 2295 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 13 × 25 = 325 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 225 + 776 = 996 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 32 = 1563 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 56 × 28 = 1568 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 496 + 322 = 818 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 965 + 921 = 1890 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 178 + 456 = 633 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 332 + 526 = 849 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 478 + 275 = 753 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 60 × 34 = 2040 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 174 + 109 = 283 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 91 × 41 = 3734 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 70 × 65 = 4551 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 71 = 2059 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 38 × 49 = 1869 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 64 × 51 = 3261 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 51 × 60 = 3062 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 57 × 94 = 5358 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 24 × 26 = 624 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 121 + 344 = 464 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 33 × 28 = 921 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 878 + 601 = 1479 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 63 × 23 = 1449 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 17 × 52 = 883 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 28 × 46 = 1288 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 993 + 139 = 1132 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 46 × 17 = 782 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 443 + 188 = 631 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 55 × 17 = 935 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 687 + 215 = 909 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 98 × 78 = 7645 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 51 × 82 = 4186 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 218 + 417 = 635 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 955 + 136 = 1095 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 917 + 933 = 1858 right or wrong? (a) Wrong (b) Right

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