2 Digit Subtraction

Here is one more screencast to show you how to subtract 2 digit numbers by breaking the equations into tens and ones.

Breaking down equations in 2-digit subtraction problems

Subtracting with a number line

Here is another screencast demonstrating how you can show your work using a number line to subtract. The key is to remember how the numbers are arranged on a number line; left to right/lowest to highest.

Using a number line to subtract 2 digit numbers

Adding 2-Digit Numbers

We have been learning how to add two digit numbers. Here are two screencasts that demonstrate  ways to show our work.

Using an open number line

Breaking a number into tens and ones