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How do you subtract whole numbers by fractions?
Simplify them.
How do you add multiple mixed fractions?
Find a common denominator, add the numerators, simplify if possible.
How do you you cross multiply?
if youre dealing with fractions then you multiply top by top and bottom by bottom then simplify
When you multiply fractions why do you multiply the fractions strait across?
This has the effect of producing a denominator in the answer that has each of the original denominators as factors. You don't have to worry about simplifying the fractions before multiplying. Of course, you may have to simplify after multiplying. There's no way out.
Adding unlike fractions?
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.
