What is 3/9 minus 7/8?
Here we will show you how to calculate 3/9 minus 7/8. We will give you the answer in fraction form and in decimal form.
We label the numbers in 3/9 minus 7/8 like this:
3/9 - 7/8 = A/B - C/D
We will use a formula that does not require you to find the lowest common denominator to find the solution. The formula is:
(AD - BC) / BD
When we fill in 3/9 minus 7/8 into the formula above, we get:
(3x8 - 9x7) / 9x8
(24 - 63) / 72
-39/72
Thus, the answer to 3/9 minus 7/8 (simplified if necessary) in fraction form is as follows:
-13/24
To get the answer to 3/9 minus 7/8 in decimal form, we simply divide the numerator by the denominator from our fraction answer:
-39 / 72 = -0.5417
Note: The fraction answer is exact, but the answer in decimal format is rounded to the nearest 4 decimals if necessary.