Number & Operations in Base Ten

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What are the Commutative Properties of Addition and Multiplication?

The commutative property is a fundamental building block of math, but it only works for addition and multiplication. This tutorial defines the commutative property and provides examples of how to use it.
What are the Associative Properties of Addition and Multiplication?

The associative property is one of those fundamental properties of math that make math work. You probably take this property for granted because it's so ingrained, but it's important to see how the guts of math work, so check out the tutorial and make sure you're solid on your fundamentals!
What's a Dividend and What's a Divisor?

When you do division problems, you need to know the vocabulary that people use to describe what number is being divided, and what number is doing the dividing. This tutorial will help you keep that vocabulary straight!
How Do You Divide Whole Numbers?

Division is a building block of math. This tutorial shows you how to perform long division by going through the process one step at a time.
How Do You Solve a Word Problem by Dividing Whole Numbers?

Word problems are a great way to see math in the real world! Math can help us answer everyday questions. Watch this tutorial to see how division is used to solve a word problem.
How Do You Find the Value of a Digit in a Whole Number?

Understanding place value is a building block of understanding numbers. Follow along with this tutorial to see how to find the value of a digit for a given number!
How Do You Multiply a Three-Digit Number by a One-Digit Number?

If you want to multiply a three digit number by a one digit number, it can be helpful to line up the multiplication vertically. This tutorial takes you through the process of multiplying!
How Do You Multiply a Two-Digit Number by a One-Digit Number?

Multiplication is a building block of math, so it's important to be comfortable with it! This tutorial gives you practice multiplying a one digit number by a two digit number.
How Do You Multiply a Two-Digit Number by a Two-Digit Number?

When you're multiplying a two digit number by a two digit number, it's important to keep the places lined up correctly. This tutorial helps you practice multiplying while keeping everything organized!
How Do You Multiply a Two-Digit Number by a Two-Digit Number Using Partial Products?

You can use partial products to help you multiply two numbers together! Follow the steps in this tutorial to see how partial products can make a multiplication problem easier!
What is Place Value for Whole Numbers?

Place value is a building block of numbers. Without place value, we couldn't keep all our numbers straight! This tutorial introduces place value and shows you the parts of a place value chart.
How Do You Round a Decimal Using a Number Line?

Rounding is an important part of math! In this tutorial, you'll see how to use a number line to help you round a decimal to a chosen place value.
How Do You Use Front-End Estimation to Estimate a Sum of Several Decimals?

Front-end estimation can be a great way to approximate a sum. In this tutorial, you'll see how to use front-end estimation to approximate the cost of school supplies!
How Do You Estimate a Sum of Decimals by Clustering?

If you want to find the approximate sum of decimals, you can round those numbers first! This tutorial shows you how to round decimals and see what numbers they're close to in order to make adding easier.
How Do You Regroup Numbers to Add Decimals Mentally?

Adding numbers mentally is easier than you might think! It can be a quick and fun skill! This tutorial shows you how to take decimals and add them mentally.
How Do You Multiply a Decimal by a Whole Number?

If you want to multiply a decimal by a whole number, just ignore the decimal point and multiply like normal! Then, bring the decimal point back for the answer. This tutorial shows you the entire process step-by-step.
How Do You Multiply a Decimal by a Whole Number Using Estimation to Place the Decimal?

When you multiply a decimal and a whole number, removing the decimal point can make multiplying easier, but where does the decimal point go when you want to get your answer? In this tutorial, you'll see how to estimate the location of the decimal point after you multiply!
How Do You Solve a Word Problem by Dividing with Decimals and Rounding Your Answer Up?

You never know where division might pop up! This word problem is a great example of using long division to solve a problem.
How Do You Order Fractions and Decimals From Greatest to Least?

If you want to compare different types of numbers, start by converting all of them to one type of number! This tutorial shows you an example of this involving fractions and decimals!
How Do You Do Long Multiplication?

Multiplying together large numbers? No problem! In this tutorial, you'll see how to perform long multiplication to find the answer (without using a calculator!). Take a look!
How Do You Round a Decimal to a Given Place Value?

Sometimes, decimals are so long that you need a way to estimate the value of the decimal. Other times, you may only need a certain amount of exactness to get your answer. This is where rounding decimals to a chosen place can be very helpful! Watch this tutorial to learn how to round a decimal to a chosen place.
What is Place Value?

Did you know numbers have place values? This tutorial introduces you to the term place value and shows you some of the most seen place values. Take a look!