E

edge

A line segment where two faces of a three-dimensional figure meet.

eighths

Eight parts of a whole that are the same size. A whole or group divided into eight equal parts or eight "fair shares." (See also fair share and one-eighth.)

equal parts

Pieces or parts of a whole that are the same size or amount. (See also fraction and fair share.)

equal sign

The symbol = shows that what is on the left of the sign is equal in value to what is on the right of the sign. For example: 2 + 2 = 4; 1 + 4 = 3 + 2.

equal to

Having the same value (=). For example, one nickel is equal to 5 pennies.

equals

The same amount or the same value. For example, 3 + 1 = 4.

estimate

1. To find about how many. For example, estimate how many beans in a jar.
2. An approximate number or a good guess.

even number

Even numbers have no leftovers if you make groups of two or two equal groups. A number that ends with 0, 2, 4, 6, or 8.

extending

Making something longer. For example, growing or repeating a pattern such as ABC extends to ABCABC.