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None. You find the common denominator and subtract.
Ex.
1 3
2 - 4 =
STEP ONE:
Find the least common multiple between the denominators.
2 4 6 8
4 8 12
As you can see, four is the least common multiple.
Now, you multiple the first fraction, 1/2, by two because the denominator in 3/4 is four.
You should have 2/4 instead of 1/2 now.
STEP TWO:
Subtract.
3 2
4 - 4 = (the denominator stays the same, so all you have to figure out is what 3-2 equals and that is 1.)
STEP THREE:
Your answer is 1/4.
I hope that helps. :)
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How do u subtract fractions?
multiply the fractions until they have common denominators and then subtract them
Why do you need a common denominator when adding and subtracting fractions but not when you multiply or divide fractions?
For subtracting and adding you cannot add or subtract unalike things. For multiplication and division you can multiply by whatever you want. In some maths you even multiply by variables such as "x". Or divide by them.
When doing fractions why is it easier to multiply and divide fractions than add and substract fractions?
It is easier to multiply or divide fractions than to add or subtract fractions because in multiplication, you just have to multiply the numerator by the numerator and the denominator by the denominator. Same applies with division of fractions, except that you have to reciprocate the fraction you're dividing with (divisor) then proceed to multiplication. Whereas, in addition and subtraction of fractions, you still have to get their Least Common Denominator (LCD).
What school subject is fractions related to?
Math is related to fractions. if you look in a math book or just online then one of the math topics is fractions. You learn how to divide, multiply, add and subtract, simplify and more about fractions and what to do with them.
Why do you invert fractions?
When you divide by fractions, you invert and multiply.
