Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 1 · 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 95 × 21 = 1995 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 135 + 973 = 1116 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 30 × 37 = 1103 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 61 × 12 = 732 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 83 × 66 = 5476 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 35 × 72 = 2520 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 429 + 342 = 773 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 271 + 303 = 574 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 52 × 57 = 2960 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 71 × 95 = 6739 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 19 × 42 = 791 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 20 × 25 = 507 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 462 + 307 = 777 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 79 × 61 = 4826 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 65 × 13 = 845 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 55 × 65 = 3575 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 73 × 20 = 1460 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 80 × 46 = 3688 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 98 × 30 = 2939 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 363 + 722 = 1085 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 42 × 50 = 2100 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 57 × 29 = 1653 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 69 × 91 = 6279 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 47 × 51 = 2397 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 660 + 706 = 1358 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 24 × 47 = 1128 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 43 × 14 = 602 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 181 + 564 = 751 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 71 × 73 = 5183 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 19 × 35 = 668 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 854 + 657 = 1511 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 54 × 50 = 2700 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 108 + 119 = 230 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 172 + 892 = 1066 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 901 + 166 = 1060 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 375 + 417 = 792 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 707 + 976 = 1674 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 258 + 172 = 430 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 27 × 89 = 2403 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 43 × 91 = 3913 right or wrong? (a) Wrong (b) Right

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