Now that you've had a chance to look at adding and subtracting up to 4 digit numbers, you can apply those same strategies to adding even larger numbers.
You may wish to review the lessons on place value before you begin. Then, watch the videos in the sections below. Keep notes of important things to remember.
In the video below, you'll see and hear about the algorithm for addition. An algorithm is a set of steps or a procedure that you can follow.
The video below discusses the algorithm for subtraction. Watch the video and see if you can describe the steps in your own words.