Here's how to subtract 4/9 from 3/8:
So we multiply 3 by 9, and get 27.
Then we multiply 4 by 8, and get 32.
Next we give both terms new denominators -- 8 × 9 = 72.
So now our fractions look like this:
Since our denominators match, we can subtract the numerators.
27 − 32 = -5
So the answer is:
Last of all, we need to simplify the fraction, if possible. Can it be reduced to a simpler fraction?
To find out, we try dividing it by 2...
Nope! So now we try the next greatest prime number, 3...
Nope! So now we try the next greatest prime number, 5...
Nope! So now we try the next greatest prime number, 7...
No good. 7 is larger than -5. So we're done reducing.There you have it! The final answer is: