Estimate and measure liquid
volumes, lengths and masses of
objects using customary units.
Solve problems involving mass,
length, and volume given in the
same unit, and reason about the
relative sizes of measurement units
within the customary system.

3rd Grade Math - Capacity, Length & Weight Lesson

CUSTOMARY UNITS weight and capacity

WEIGHT

ounce pound ton

There are 16 ounces in 1 pound. There are 2,000 pounds in 1 ton.

A TON is larger than a POUND. A POUND is larger than an OUNCE.

CAPACITY

fluid ounce cup pint quart gallon

There are 8 fluid ounces in 1 cup. There are 2 cups in 1 pint. There are 2 pints in 1 quart. There are 4 quarts in 1 gallon.

A GALLON is larger than a QUART. A QUART is larger than a PINT. A PINT is larger than a CUP. A CUP is larger than a FLUID OUNCE.

LENGTH

Common tools for measuring length are: rulers, measuring tape, and yardsticks.

Examples of measuring tools which are not used for measuring length are: measuring spoons, measuring cups, and scales.

Length is typically measured in customary or metric units.

Inches and feet are examples of customary units.

The hair clip in the image below is 2 inches in length.

A foot is longer than an inch.

How long is a foot?

The length of an average piece of paper is about a foot.
Most adults' shoes are a little shorter than a foot.
There are 12 inches in 1 foot.

How long is an inch?

The length of a small paperclip is about an inch.
The length of most house keys is about 2 inches.
The height of a can of a soda is about 5 inches.