To add and subtract fractions, you need a common denominator.
The denominator is the bottom number of a fraction. A common denominator simply means that they are both the same.
To find a common denominator, compare the multiples of the numbers in the denominators. Remember, the common denominator is the same as a common multiple.
The denominator is the bottom number of a fraction. A common denominator simply means that they are both the same.
To find a common denominator, compare the multiples of the numbers in the denominators. Remember, the common denominator is the same as a common multiple.
When dividing and multliplying there is no need for a common denomanter because in those problems your first method of working the problem is to cross multiply.
