Two-term ratio- compares two quantities measured in the same units (ex: there is a bag with 20 marbles. What is the two-term ratio of black marbles to red marbles)? 10:4.
- Three-term ratio- compares three quantites measured in the same units (ex: what is the three-term ratio of black,red and blue marbles)? 10:4:6.
- Part-to-part ratio- compares different parts of a group to each other (ex: what is the part-to-part ratio of blue to red marbles)? 6:4
- Part-to-whole ratio- compares one part of a group to the whole group (ex: what is the part-to-whole ratio of blue marbles to all the marbles)? 6:20
Rate- a comparison of quantities measured in different units (ex: $1.69 per 100 grams or $1.69/100g)
Proportion- is an equation which states that two ratios or fractions are equal (ex: 3/8 = 9/24)