1- escreva a porcentagem correspondente a cada uma das seguintes razões.

a)4/5=
b)13/25=
c)11/10=
d)7/2=
e)9/4=
f)7/8=

3/5 = ( 3 * 100 )/5 = 300/5 = 60%
3/10 = ( 3 * 100)/10 = 300/10 = 30%
17/20 = ( 17 * 100)/20 = 1700/20  = 170/2 = 85%
5/8 = ( 5 * 100)/8 = 500/8 =62,5 %
9/4 = ( 9 * 100)/4 = 900/4 =225%

A) 1/5=0,2=20%
b) 1/8=0,125=12,5%
c) 9/10=0,9=90%
d) 11/25=0,44=44%

A) 3/5 = 0,6 = 60%
d) 5/8 = 0,625 = 62,5%
b) 3/10 = 0,3 = 30%
e) 9/4 = 2,25 = 225%
c) 17/20 = 0,85 = 85%
f) 5/2 = 2,5 = 250%

A)0.05%
b) 0.08%
c)0.9%
d)2.75%