Adding & Subtracting Fractions (Negative & Positive)

Front

What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

Front

How do you add fractions with the same denominator?

Back

To add fractions with the same denominator, keep the denominator the same and add the numerators. For example, 1/4 + 2/4 = (1+2)/4 = 3/4.

Front

How do you subtract fractions with the same denominator?

Back

To subtract fractions with the same denominator, keep the denominator the same and subtract the numerators. For example, 3/5 - 1/5 = (3-1)/5 = 2/5.

Front

What is the first step in adding fractions with different denominators?

Back

The first step is to find a common denominator, which is a multiple of both denominators.

Front

How do you find a common denominator for 1/3 and 1/4?

Back

The least common denominator (LCD) of 1/3 and 1/4 is 12. Convert both fractions: 1/3 = 4/12 and 1/4 = 3/12.

Front

What is the rule for adding a negative fraction to a positive fraction?

Back

When adding a negative fraction to a positive fraction, subtract the absolute values and keep the sign of the larger absolute value. For example, -1/4 + 1/2 = -1/4 + 2/4 = 1/4.

Front

What is the result of -7/4 - 3/4?

Back

-7/4 - 3/4 = -10/4 = -5/2.

Front

What is the result of -13/8 + 7/8?

Back

-13/8 + 7/8 = -6/8 = -3/4.

Front

What is the result of 5/7 + (-9/7)?

Back

5/7 + (-9/7) = (5 - 9)/7 = -4/7.

Front

What is the result of -2/6 - 3/6?

Back

-2/6 - 3/6 = -5/6.