Count back & use the relationship between addition and subtraction to subtract within 20. Warm up with a Mystery Math Mistake to find the error in DC's addition. Use ...

Microsoft Excel is a powerful spreadsheet program that can be used for a variety of tasks, including basic math. Here's how to use Excel as a calculator to perform basic arithmetic operations such as ...

Subtracting larger numbers in your head is not always easy, so you can use the column method to take one number away from another. You write the larger number above the smaller number, so that the ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Hello learners. My name's Miss White and I'm very excited to be teaching you today. For this lesson you ...

Students put all of their addition and subtraction skills together to solve equations. In this lesson, students put all of their addition and subtraction skills together to solve equations. Julia ...

Subtraction is taking away one number from another. When you subtract it gives you the difference between two numbers. Here are 7 blocks. If you take away three blocks, how many are left? There would ...

When you are doing arithmetic by hand because your calculator’s batteries just gave up and your laptop is in the other room, it’s best if you can check your calculations with a different process than ...

The calculator on your Apple devices can do more than add, subtract, multiply and divide. Here's how it can help you with all kinds of math problems.