Apply and extend previous understandings of numbers to the system of rational numbers. Understand a rational number as a point on the number line. Extend number line diagrams and coordinate axes familiar from previous grades to represent points on the line and in the plane with negative number coordinates.
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In the United States, the summer of 2012 was the warmest summer on record. The winter of 2013-2014 is on the way to becoming the coldest winter in history. Use the <strong>open number line</strong...