Rational numbers are numbers that can be written as a fraction, where the numerator and denominator are both integers (whole numbers). They can be written in the form a/b, where a and b are integers and b is not equal to 0.

- 1/2
- -3/4
- 5 (can be written as 5/1)
- 0 (can be written as 0/1)

- Rational numbers can be added, subtracted, multiplied, and divided.
- The sum or product of two rational numbers is also a rational number.
- Rational numbers can be represented on a number line.
- Every integer is a rational number (for example, 5 can be written as 5/1).

To add or subtract rational numbers, first make sure the denominators are the same. Then, add or subtract the numerators and keep the denominator the same.

To multiply or divide rational numbers, simply multiply or divide the numerators and denominators.

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Perimeter Worksheet/Answer key

Perimeter Worksheet/Answer key

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Geometry (NCTM)

Analyze characteristics and properties of two- and three-dimensional geometric shapes and develop mathematical arguments about geometric relationships.

Identify, compare, and analyze attributes of two- and three-dimensional shapes and develop vocabulary to describe the attributes.

Use visualization, spatial reasoning, and geometric modeling to solve problems.

Use geometric models to solve problems in other areas of mathematics, such as number and measurement.