1/5 = 8/40
7/8 = 35/40
Their sum is 43/40 = 13/40
Convert them to improper fractions with a common denominator.
keep the denominator multiply the whole number by the denominator and add the numerator.
To convert a mixed number to an improper fraction, multiply the denominator by the whole number, add that total to the numerator and put the whole thing over the original denominator. To convert an improper fraction to a mixed number, divide the denominator into the numerator. The answer is the whole number. Put any remainder over the original denominator to create the fraction part.
Just make the number the numerator, and slap in a 1 as a denominator.
multiply the numerator and the denominator by the same number, or divide each side by a common factor.
First, find a common denominator for the two (or more) fractions. Then, for each fraction, multiply numerator and denominator by the same number (different numbers for different fractions, though), to convert to the common denominator.
1 1/4, 20/16, 30/24, 40/32 and so on.... 5/4 would have the lowest denominator. Multiplying numerator and denominator by the same number will give equivalent value fractions.
To convert an improper fraction to a mixed number, divide the denominator into the numerator. The answer is the whole number. Put any remainder over the original denominator to create the fraction part.
To convert an improper fraction to a mixed number, divide the denominator into the numerator. The answer is the whole number. Put any remainder over the original denominator to create the fraction part.
You multiply or divide numerator and denominator by the same number. For example, 1/2 = 3/6 (multiplying numerator and denominator by 3). You often need to do this to (a) convert fractions to a common denominator, and (b) simplify fractions (it is awkward if you present a final result as 113/226, and later find out that this is really equivalent to 1/2).
The majority of mixed numbers will convert to improper fractions. To convert a mixed number to an improper fraction, multiply the denominator by the whole number, add that total to the numerator and put the whole thing over the original denominator.
If the fractions do not all have the same denominator, find a common multiple of the denominators (ideally the lowest common multiple) and convert the fractions to equivalent fractions with this denominator. Now with all the fractions with the same denominator, add together the numerators. Finally, reduce the fraction to simplest terms, converting any improper fraction to a mixed number.