To compose numbers 11-20 using ten frames, you can start by using two ten frames side by side. Place ten dots in one ten frame and add dots to the second ten frame to get to the desired number. For example, to compose the number 13, put 10 dots in one ten frame and then add 3 more dots to the second ten frame.
To decompose numbers 11-20 using ten frames, start with a full ten frame representing the number you want to decompose. Then, remove dots from one ten frame and add them to the second ten frame until you have the desired numbers. For example, to decompose the number 18, take a full ten frame with 10 dots and remove 2 dots from the first frame, placing them in the second frame. Continue this process until you have taken 8 dots from the first frame and placed them in the second frame.
Compose and decompose numbers 11-20 using ten frames.
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