Everyday Math Skills Workbooks series - Kitchen Math

50
Using Measurement in the Kitchen
Using Measurement in the Kitchen
50 Kitchen Math Workbook
Ratios in the Kitchen #19
Ratios, equivalent fractions, multiplication, division
A ratio is a way of comparing two amounts. In the kitchen, ratios are often
used to figure out “before and after” amounts.
Example 1: One cup of uncooked rice will make 3 cups of cooked rice.
The ratio of uncooked to cooked is 1 to 3.
The fraction ⅓ names this ratio.
Problem: You want to make 6 cups of cooked rice. How many cups of
uncooked rice should you use?
Solution: For rice, the ratio of “before” to “after” is ⅓
You know you want 6 cups “after.” The equivalent ratio is
Ask yourself this question. What number will make the
fraction equal? What number do I have to multiply the 3 by to
get to 6? (2) Therefore you must multiply the top too: 1 x 2 = 2.
You should use 2 cups of uncooked rice.
Example 2: One cup of dry pasta will make 2 cups of cooked pasta.
Problem: I need 10 cups of cooked pasta for our family dinner.
Solution: The ratio is 1 to 2 or ½. We want 10 cups.
X 5
X 5
We need to cook 5 cups of dry pasta for 10 cups of cooked pasta.
Kitchen Math Workbook