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$Adding and subtracting fractions by finding a common denominator$

Adding and subtracting fractions by finding a common denominator

When the denominators are unequal, we have to find a common denominator before we can add or subtract the fractions. To find a common denominator, we need to find the least common multiple (LCM) of the denominators. Then we can use the LCM as our common denominator. In fact, we call that the “least common denominator,” because it’s the smallest common denominator we can use.

How to add or subtract polynomials

When adding and subtracting polynomials, you’re really just looking for like terms to combine. The largest exponent in a polynomial is called the degree of the polynomial. The term with the largest exponent is called the leading term, because the terms of a polynomial are usually written in descending order of their exponents.

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