The result of subtracting one number from another. How much one number differs from another.

How many parts of a whole: • the top number (the numerator) says how many parts we have. • the bottom number (the denominator) says how many equal parts the whole is divided into

Bigger. The symbol > means greater than (the symbol < means less than).

Going side-to-side, like the horizon.

A triangle with two equal sides.

Jumping by parts of a number to solve a calculation.

A Metric measure of distance. Equal to 1,000 meters. The abbreviation is km.

Smaller. The symbol < means less than

The average of the numbers: a calculated "central" value of a set of numbers. To calculate it: • add up all the numbers • then divide by how many numbers there are.

Less than zero.

The rules that say which calculation comes first in an expression. They are: • do everything inside parentheses first, follow order of operations in parenthesis: () • then do exponents, like x2, x3 etc • then do multiplies and divides from left to right • then do the adds and subtracts from left to right

The answer when two or more values are multiplied together.

The answer after we divide one number by another.

A triangle that has a right angle (90°)

The result of adding two or more numbers.

A flat shape with 4 straight sides that has a pair of opposite sides parallel.

A general term meaning 1.

In an up-down direction or position. Upright.

The distance from side to side.

The line on a graph that runs horizontally (left-right) through zero.

The line on a graph that runs vertically (up-down) through zero.

The whole number between −1 and 1, with the symbol 0. Shows that there is no amount.