Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 446 · 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 22 × 84 = 1848 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 829 + 843 = 1669 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 570 + 365 = 937 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 838 + 612 = 1443 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 791 + 237 = 1028 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 199 + 218 = 422 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 99 × 33 = 3276 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 19 × 46 = 874 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 51 × 20 = 1020 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 21 × 36 = 757 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 74 × 84 = 6216 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 18 × 91 = 1638 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 98 × 51 = 4990 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 895 + 682 = 1578 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 57 × 19 = 1083 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 430 + 563 = 993 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 21 × 37 = 777 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 627 + 541 = 1168 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 40 × 98 = 3924 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 672 + 180 = 852 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 27 × 78 = 2106 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 49 × 63 = 3087 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 38 × 97 = 3695 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 646 + 714 = 1368 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 58 × 17 = 993 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 68 × 86 = 5852 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 37 × 24 = 886 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 720 + 933 = 1653 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 689 + 733 = 1426 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 60 × 85 = 5100 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 52 × 29 = 1508 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 699 + 947 = 1646 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 31 × 70 = 2164 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 91 × 21 = 1911 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 98 × 41 = 4017 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 26 × 69 = 1788 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 59 = 880 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 97 × 61 = 5917 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 877 + 712 = 1589 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 652 + 313 = 971 right or wrong? (a) Wrong (b) Right

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