To find the ratio decimal form, write each ratio as it's corresponding fraction, then divide. Simplify fractions, if possible.
2:3= 2/3= 0.6666666= 0.67 rounded
3:7= 3/7= 0.42857= 0.43 rounded
3:6= 3/6= 1/2= 0.5
3:8= 3/8= 0.375
2:5= 2/5= 0.4
3:7= 3/7= 0.42857= 0.43 rounded
2:4= 2/4= 1/2= 0.5
Hope this helps! :)