Write the quantities in the same order
Use a colon to show the ratio, such as 3:2
Make sure both quantities are in the same units
Simplify the ratio by dividing both parts by the same number
Compare parts by finding how many times one quantity fits into the other
Use fractions if needed, such as 3/2
Use equivalent ratios by multiplying or dividing both parts by the same number
Check that the ratio stays the same after simplifying or scaling