Subtract.
9/10-3/8
Write your answer as a fraction in simplest form.
To subtract fractions, we need to find a common denominator. The least common multiple of 10 and 8 is 40.
To convert 9/10 to have a denominator of 40, we multiply the numerator and denominator both by 4.
9/10 * 4/4 = 36/40
To convert 3/8 to have a denominator of 40, we multiply the numerator and denominator both by 5.
3/8 * 5/5 = 15/40
Now we can subtract these fractions:
36/40 - 15/40 = (36 - 15)/40 = 21/40
Therefore, the simplified answer is 21/40.