▶ Calculate percentages with mental math - video from Math Mammoth - YouTube - 0 views
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"http://youtu.be/x4mREPIzDIw" Mental Math - percent of a number, starts easy and examples increase
Modeling Subtraction Integers - YouTube - 0 views
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"http://youtu.be/RcTaKAkml0I" modeling subtraction of integers
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