Can someone please help me correct these? tell me which ones are wrong and explain.

1. Convert 1/5 into a decimal number.(Points : 4)

0.5


2. Convert 7/10 to a decimal number.(Points : 4)
0.3

3. Convert -7/5 to a decimal number.(Points : 4)

-1.4


4. Convert 21/4 to a decimal number.(Points : 4)
5.25

5. Convert -4 3/4 to a decimal number.(Points : 4)

-4.75


6. Convert 2 2/5 into a decimal number.(Points : 4)
2.5

7. Convert -0.4 to a fraction. The correct answer is reduced to its simplest form.(Points : 4)
-2/5


8. Convert 0.375 to a fraction. The correct answer is reduced to its simplest form.(Points : 4)
3/8

9. Convert -0.42 to a fraction. The correct answer is reduced to its simplest form.(Points : 4)

-42/50

10. Convert -3.4 to a fraction. The correct answer is reduced to its simplest form and expressed as a mixed number.(Points : 4)

-3 2/5


11. Convert 4.64 to a fraction. The correct answer is reduced to its simplest form and expressed as a mixed number.(Points : 4)
4 16/25


12. Convert 8.06 to a fraction. The correct answer is reduced to its simplest form and expressed as a mixed number.(Points : 4)
8 6/10



13. Convert 1/4 into a percent.(Points : 4)

25%


14. Convert -1/8 into a percent.(Points : 4)
-12.5%



15. Convert 7/7 into a percent.(Points : 4)
7%

16. Convert 6/5 to a percent.(Points : 4)

80%


17. Convert 1/20 to a percent.(Points : 4)

20%


18. Convert -4 1/2 to a percent.(Points : 4)