Operations with Rational Numbers

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

The sum of two negative numbers is always negative.

The product of two negative numbers is always positive.

The difference of two rational numbers is found by subtracting the second number from the first.

To add a positive and a negative rational number, subtract the absolute value of the negative number from the positive number and keep the sign of the number with the larger absolute value.

The cost per item is calculated by dividing the total cost by the number of items.

Rounding to the nearest cent means adjusting a monetary amount to the closest hundredth place.

Adding a negative number is equivalent to subtracting the absolute value of that number.

To calculate change, subtract the total cost of the purchase from the amount paid.

To multiply fractions, multiply the numerators together and the denominators together.