Example to show work: What is happening when subtracting.
Just look at the second part illustration to tell you what to X out in the
first part. Circle what is left over after that. Count up your left overs.
That is your answer.
You will need something to manipulate/count to help you solve subtraction problems.
https://www.youtube.com/watch?v=GdXClek-05I
https://www.youtube.com/watch?v=of1UHlQBTvE
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