H

half hour

An amount of time equal to 30 minutes. One-half of an hour (60 minutes) is 30 minutes.

half-dollar

A coin worth 50 cents (50¢); half of one dollar.

halves

2 parts of a whole that are the same size. The singular of halves is half. (See also fair share and one-half.)

halving

Making something half as big; subtracting half of a number
(12 − 6 = 6) or dividing a number by two (12 ÷ 2 = 6).

height

The distance from top to bottom; how tall something is.

hexagon

A two-dimensional (2-D) shape having 6 sides and 6 corners.

horizontal

Going side-to-side. For example, the horizontal axis goes side-to-side or left to right on a graph.

hour

A unit of time equal to 60 minutes.

hour hand

The small hand on a clock that shows the hour. It takes 60 minutes for the hour hand to travel once around the clock.

hundreds

1. The whole numbers that are three digits long (100 − 999).
2. The third place or column from the right is called the hundreds place. For example, in the number 215, the 2 represents 2 hundreds.