Convert the following decimals to percentages and percentages to decimals.

To convert a decimal to a percentage, multiply the decimal by 100 and add the percent symbol (%).

1. $0.78 = 0.78 \times 100\% = \boxed{78\%}$
2. $3.6 = 3.6 \times 100\% = \boxed{360\%}$
3. $4.85 = 4.85 \times 100\% = \boxed{485\%}$
4. $3.93 = 3.93 \times 100\% = \boxed{393\%}$
5. $1.38 = 1.38 \times 100\% = \boxed{138\%}$
6. $4.77 = 4.77 \times 100\% = \boxed{477\%}$
7. $0.66 = 0.66 \times 100\% = \boxed{66\%}$

To convert a percentage to a decimal, divide the number by 100 and remove the percent symbol (%). 2. $339\% = \frac{339}{100} = \boxed{3.39}$ 5. $185\% = \frac{185}{100} = \boxed{1.85}$ 7. $466\% = \frac{466}{100} = \boxed{4.66}$ 8. $449\% = \frac{449}{100} = \boxed{4.49}$ 11. $117\% = \frac{117}{100} = \boxed{1.17}$ 12. $457\% = \frac{457}{100} = \boxed{4.57}$ 13. $203\% = \frac{203}{100} = \boxed{2.03}$ 15. $189\% = \frac{189}{100} = \boxed{1.89}$