Why Are Telephone Numbers XXX-XXX-XXXX and why not XXXXXXXXXX?

Ever wonder why telephone numbers are 3 numbers then 3 more numbers then 4 numbers? I am not talking about why from a process standpoint.  Although it is good to know that the first three numbers are the Area Code, the second three are the City Code, and the last four are the Line Number,[…]

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Number Sense Using Base Ten

Developing number sense is a critical skill that students need to learn.  When teaching Place Value manipulatives can be very powerful in developing this skill. Do you see the pattern that is shown using the MasterPieces? First, look at the unit cubes. You will see that from the top that each cube makes the shape[…]

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