Q&A #7370

Teachers' Lounge Discussion: Use of commas in math

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From: Debra Muse

To: Teacher2Teacher Public Discussion
Date: 2001122819:20:47
Subject: Commas in math

By breaking numbers into chunks of three,  or in place value terms: 
in periods, makes it so easy to glance at a large number, count the
corresponding periods and read it with ease.  For example: 
962,189,461,050 is read 962 then say the fourth period's name at the
comma (and each subsequent period's name at its comma) ~ billion, 189
million, 461 thousand, 50.  Beginning at the left, you read everything
up to the comma as a number; at each comma you say that period's name.
Voila.  Even my third graders can read the above number!

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