Operations with Rational Numbers

Front

What is a rational number?

Back

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

Front

What is the product of two positive numbers?

Back

The product of two positive numbers is always positive.

Front

What is the product of two negative numbers?

Back

The product of two negative numbers is also positive.

Front

What is the result of multiplying a positive number by a negative number?

Back

The result of multiplying a positive number by a negative number is negative.

Front

How do you simplify the expression -8 * (-3)?

Back

To simplify -8 * (-3), multiply the absolute values and apply the rule that the product of two negative numbers is positive: -8 * (-3) = 24.

Front

How do you calculate the number of items you can buy with a given amount of money?

Back

To calculate the number of items you can buy, divide the total amount of money by the cost of one item.

Front

If Mrs. Thomas has $71.00 and each bottle of juice costs $3.55, how do you find the number of bottles she can buy?

Back

Divide $71.00 by $3.55 to find the number of bottles: 71.00 / 3.55 = 20 bottles.

Front

What is the formula to find the cost per item?

Back

The cost per item can be found by dividing the total cost by the number of items.

Front

How do you round a number to the nearest cent?

Back

To round a number to the nearest cent, look at the third decimal place: if it's 5 or more, round up; if it's less than 5, round down.

Front

What is the cost of one quart of olive oil if Nancy spent $44.59 on 5.25 quarts?

Back

To find the cost per quart, divide $44.59 by 5.25: $44.59 / 5.25 = $8.49 per quart.