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# 3rd grade (U.S.)

3rd grade is full of some of the most important ideas in mathematics. You'll extend the addition and subtraction that you did in second grade to more than two digits. You will also get your first exposure to the ideas of multiplication, division, and fractions, which will be used the rest of your mathematical lives (we'll even use some letters as placeholders for unknown numbers along the way). 3rd grade is also when we first think about area (how much "space" something takes on a surface) and perimeter (the distance around a shape). All of that will be rounded out by making sure that you can apply these ideas in the real world and see patterns in the mathematical world. (Content was selected for this grade level based on a typical curriculum in the United States.)
Community Questions
Multiplication and division
Multiplication and division are two of the most important operations to understand in math. If you drink 2 cups of water, 5 times, how much water have you drunk? If you need to divide 9 slices of cake between 3 friends, how much cake does each friend get?
All content in “Multiplication and division”

### Concept of multiplication and division

Let's introduce ourselves to two of the most fundamental ideas in all of mathematics: multiplication and division! Common Core Standards: 3.OA.A.1, 3.OA.A.2

### Applying multiplication and division

Let's now apply your new found understanding of multiplication and division! Common Core Standards: 3.OA.A.3, 3.OA.A.4, 3.OA.B.6

### Two-step word problems

We are now going to solve real-world problems using multiple steps. Along the way, we'll be using letters to represent unknown quantities. Common Core Standard: 3.OA.D.8

### Multiplying by tens

As we'll see in this tutorial, multiplying a multiple of 10--like 10, 20, 30, 40, etc.--by a single digit number is not too much more complicated. Common Core Standard: 3.NBT.A.3