First question:
1/8 as a decimal is found by dividing 1 by 8. Use a calculator.
1/8 = 0.125
To change a decimal to a percent, move the decimal point 2 places right.
0.125 = 12.5%
Second question:
0.8 is read as "eight tenths." Write eight tenths as a fraction, then reduce it.
0.8 = 8/10 = 4/5
Now you need it as a percent. To change a decimal to a percent, move the decimal point 2 places right.
0.8 = 80%
Third question:
A percent is a ratio out of 100. 55% means 55 to 100.
55% = 55/100
Now reduce the fraction. Divide the numerator and denominator by 5.
55/100 = 11/20
To change a percent to a decimal, move the decimal point two places left.
55% = 0.55