A

add

To join two or more numbers or things to make a new total.

addend

The numbers that are added in an addition problem are the addends. For example, in the problem 3 + 2, 3 and 2 are the addends. addition

addition

Finding the total of two or more numbers. For example, 2 + 3 = 5. The symbol to show addition is +.

alphabet shorthand

Using letters of the alphabet to represent a pattern.

analog clock

A clock with hours marked from 1 to 12. The position of the hour and minute hands show the time.

area

The amount of space that a shape covers. Area is measured in square units.

associative property of addition

When you have 3 or more addends, the sum is the same no matter how you group the numbers. For example, (2 + 3) + 4 = 2 + (3 + 4).

axis

Reference lines on graphs and grids. The horizontal and vertical axes meet at the origin or zero. The plural of axis is axes.