Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 729 · 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 236 + 506 = 741 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 59 × 49 = 2891 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 131 + 769 = 904 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 41 × 77 = 3157 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 505 + 471 = 976 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 84 × 60 = 5040 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 809 + 985 = 1794 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 56 = 1400 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 184 + 912 = 1099 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 23 × 83 = 1909 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 98 × 20 = 1960 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 69 × 80 = 5518 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 964 + 842 = 1806 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 995 + 252 = 1256 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 73 × 20 = 1459 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 870 + 707 = 1577 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 993 + 728 = 1721 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 193 + 605 = 798 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 973 + 313 = 1290 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 89 × 53 = 4716 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 68 × 72 = 4904 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 916 + 237 = 1153 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 88 = 2647 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 18 × 57 = 1020 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 20 × 90 = 1800 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 26 × 20 = 523 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 51 × 98 = 4998 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 69 × 99 = 6831 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 623 + 394 = 1017 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 915 + 653 = 1568 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 67 × 29 = 1945 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 704 + 736 = 1449 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 893 + 183 = 1076 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 122 + 338 = 456 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 148 + 262 = 407 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 168 + 713 = 881 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 98 × 17 = 1666 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 433 + 590 = 1023 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 875 + 882 = 1748 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 18 × 88 = 1588 right or wrong? (a) Right (b) Wrong

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