#### Rounding digit

When rounding a decimal, the rounding digit is the digit in the last position you keep.

#### Repeating decimal

A decimal that has one or more digits that repeat forever.

#### Repeated solution

Multiple solutions for an equation are the same.

#### Remainder

If a divisor dies not divide a dividend evenly, the remainder is the whole number left over after the division.

#### Relation

Any set of ordered pairs.

#### Red herring

Unnecessary information in an applied problem.

#### Rectangular coordinate system

Formed by two real number lines intersecting at right angles.

#### Real part

The part of a complex number that is added to the imaginary part. $a$ in $a + bi$.

#### Real numbers

The numbers that you use in everyday life: $-1, 0, \frac{1}{2}, 3, …$.

#### Real number line

The diagram used to represent real numbers.

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