How to add and subtract rational numbers

Get a common denominator and add / subtract.

Example: (1/8) + (2/8) = Since they are the same denominator, add (3/8)

Example: (1/8) - (2/8) = (-1/8)

Example: (1/8) + (1/4) = They are not same denominator so:

Multiply one of the fractions by a factor over a factor (x/x) to make it the same denominator!

(1/4) * (2/2) = (2/8)

(1/8) + (2/8) = (3/8)

Example: (1/8) + (1/7) = If they are not easily factored, just use this trick:

Multiply the left fraction by the right denominator and the right fraction by the left denominator

(1/8) * (7/7) = 7/56

(1/7) * (8/8) = 8/56

7/56 + 8/56 = 15/56

Rational numbers are just numbers that can be divided and made into 2 integers.

Step-by-step explanation:

Rational numbers can be the following and more:

•1/2 is a rational number (1 divided by 2, or the ratio of 1 to 2)

• 0.75 is a rational number (3/4)

• 1 is a rational number (1/1)

• 2 is a rational number (2/1)

• 2.12 is a rational number (212/100)

• −6.6 is a rational number (−66/10)

• etc

The reason for this is because these numbers can be multiplied and made into 2 Integers.

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