Rebecca had 9/10 of a yard of ribbon. Then she gave 7/20 of a yard to a friend. How much does she have left?
9/10 - 7/20 = 18/20-7/20 = 11/20 yds left.
thx
thank you @henry2, :)
To find out how much ribbon Rebecca has left, we can subtract the amount she gave to her friend from the amount she had initially.
Rebecca had 9/10 of a yard of ribbon.
Next, she gave 7/20 of a yard to her friend.
To subtract two fractions, the denominators (bottom numbers) must be the same. Since the denominators (10 and 20) are different, we need to find a common denominator.
The least common multiple (LCM) of 10 and 20 is 20, so we will convert both fractions to have a denominator of 20.
To convert 9/10 to have a denominator of 20, we multiply the numerator and denominator by 2:
(9/10) * (2/2) = 18/20
To convert 7/20 to have a denominator of 20, we don't need to change anything since the denominator is already 20.
Now that we have both fractions with a denominator of 20, we can subtract them:
18/20 - 7/20 = (18 - 7)/20 = 11/20
Therefore, Rebecca has 11/20 of a yard of ribbon left.