Measurement and data

This course is a part of 4th grade, a 17-course Topic series from Khan Academy.

When we measure anything, we do it in human-defined 'units'. Different units were defined in different places and for different scales. The two most common are U.S. customary units and metric units. Let's think about how to convert between and among them! We'll also continue thinking about perimeter and area!

This course contains 12 segments:

Estimating mass

An introduction to units for measuring mass. The metric units used in this tutorial are grams and kilograms. The US customary units in this tutorial are ounces and pounds.

Estimating volume

An introduction to units for measuring volume. The metric units used in this tutorial are milliliters and liters. The US customary units in this tutorial are cups, pints, quarts, and gallons.

Estimating length

An introduction to units for measuring length. The metric units used in this tutorial are millimeters, centimeters, meters, and kilometers The US customary units in this tutorial are inches, feet, yards, and miles.

Time

An introduction to units for measuring time. The units used in this tutorial are seconds, minutes, and hours.

Converting units of mass

Learn how convert larger units of mass to smaller units. The metric units used in this tutorial are grams and kilograms. The US customary units in this tutorial are ounces and pounds.

Converting units of volume

Learn how convert larger units of volume to smaller units. The metric units used in this tutorial are milliliters and liters. The US customary units in this tutorial are cups, pints, quarts, and gallons.

Converting units of length

Learn how convert larger units of length to smaller units. The metric units used in this tutorial are millimeters, centimeters, meters, and kilometers The US customary units in this tutorial are inches, feet, yards, and miles.

Converting units of time

Learn how convert larger units of time to smaller units. The units used in this tutorial are seconds, minutes, and hours.

Money word problems

Learn how to solve a variety of problems involving money.

Conversion word problems

Use the four operations to solve word problems involving distances, liquid volumes, masses of objects. Practice includes both metric and US customary units of measure.

Area and perimeter

Rectangles are common shapes that you will often find the need to compare. Who has a bigger poster size? Whose yard has more grass to mow? We'll learn about length, width, area, and perimeter--about all you need to know to begin comparing!

Line plots with fractions

Learn how to create and read line plots that use fractions.