The Real Number Line: A Review

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Presentation transcript:

The Real Number Line: A Review Mrs. Curia Sept. 4, 2012

Bell Ringer

Characteristics of a Number Line A number line represents the spectrum of real numbers. It may be horizontal or vertical. Points plotted represent real number values. Regions shaded in represent sets of values plotted.

Plotting on a number line Filled in circle: includes the value Hollow circle: does not include the value Shading between dots: includes all values -4 -3 -2 -1 0 1 2 3 4 5

Practice Plotting… X = 3 X = -1 X = ½ X < 1 X > -2

Graphing Rational Numbers on a Number Line Mark EVENLY between numbers Example: x = ¼ -4 -3 -2 -1 0 1 2 3 4 5

Showing Addition/Subtraction on a Number Line Plot the first number Count the spaces forward or backward (according to the second number) Plot the solution Example: ½ + ½ = 1 -4 -3 -2 -1 0 1 2 3 4 5

MORE PRACTICE Try graphing these addition problems on your own.