Here are the answers filled in:
a ratio is a comparison of two qualities.
a unit rate compares a quantity to one.
a proportion is an equation that shows two ratios are equal.
the numerator is the number above the fraction line in a ratio.
the ratio 8:4 simplified is 2:1.
to find a unit rate, divide the numerator by the denominator.
if 3 pencils cost $1.50, the unit rate is $0.50 per pencil.
a rate that compares distance to time is called speed.
in the ratio 5:10, the number 10 is the denominator (or the second term).
if two ratios form a proportion, their cross-products are equal.