tom had 7/8 of a cup of lemon juice.after making a pie he had 1/2 cup of lemon juice left.how much lemon juice did he use in the pie?
7/8 - 1/2 = 7/8 - 4/8 = 3/8
To find out how much lemon juice Tom used in the pie, we need to subtract the amount of lemon juice he had left from the amount he started with.
Tom started with 7/8 cup of lemon juice and ended up with 1/2 cup left. To find the difference, we subtract 1/2 from 7/8.
Since the denominators (8 and 2) are not the same, we need to make them the same by finding a common denominator. In this case, the least common multiple of 8 and 2 is 8.
Next, we convert both fractions to have a denominator of 8:
7/8 = 7/8 * 1/1 = 7/8
1/2 = 1/2 * 4/4 = 4/8
Now we can subtract the fractions:
7/8 - 4/8 = (7 - 4)/8 = 3/8
Therefore, Tom used 3/8 cup of lemon juice in the pie.