Proportion word problems - pre-algebra lesson
I solve three word problems that have to do with equal ratios — therefore, a proportion is involved. However, I don't use a proportion to solve every problem. In the first problem, I use a table of equal ratios. In the second, I write a proportion and solve it by cross-multiplying. And I solve the last problem in two different ways — using proportional thinking and then also with a proportion.
See also
How to find the unit rate, including with fractions — video lesson
Math Mammoth Grade 7 curriculum (pre-algebra)