4th grade is the time to start really fine-tuning your arithmetic skills. Not only will you be a multi-digit addition and subtraction rockstar, but you'll extend the multiplication and division that you started in 3rd grade to several digits. You'll also discover that you sometimes have something left over (called a "remainder") when you divide. In 3rd grade you learned what a fraction is. Now you'll start adding, subtracting, multiplying, and comparing them. You'll also see how they relate to decimals. On other fronts, you'll learn how to convert between different units (which is super important when comparing the size and speed of robot unicorns in different countries) and continue your journey thinking about various shapes in two dimensions. Some of the foundational concepts of geometry (like lines, rays and angles) also get introduced. As always, we'll round this out with a healthy dose of applied word problems and explorations of number patterns and properties (including the ideas of factors, multiples and prime numbers). The fun must not stop! (Content was selected for this grade level based on a typical curriculum in the United States.)
Community Questions

# Measurement and data

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!
All content in “Measurement and data”

## Measuring with metric and U.S. customary units: intro

The International System of Units used today is based on the metric system. The United States, however, likes to dance to a different drummer and still uses the old British Imperial System (U.S. customary system) for most of its measuring. This tutorial will introduce you to both for measuring distance, volume, weight and time. Common Core Standard: 4.MD.A.1

## Unit conversion

When you first started measuring things in units in 2nd grade, you saw that you might want to use different units depending on the scale, application or culture that you are in. You can imagine that you'd want to convert from one unit to another when needed. Whether we're moving between metric and U.S. customary units, between ounces and pounds, or between meters and kilometers....these conversion examples and explanations are going to help a lot! Common Core Standard: 4.MD.A.1

## Word problems: moving between units of measurement

Are we having fun yet? We are! Let's solve word problems involving distances, intervals of time, liquid volumes, masses of objects, and money, including problems involving simple fractions or decimals, and problems that require expressing measurements given in a larger unit in terms of a smaller unit. Common Core Standard: 4.MD.A.2

## Area and perimeter

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

## Data

Data is a collection of facts, such as values or measurements. Now that we are beginning to use units of measurements, let's start visualizing those measurements (or data) in way that's easy to understand and compare.