6.NS.6

Plot rational numbers on number lines and ordered pairs on coordinate planes.

Recognize when ordered pairs are reflections of each other on the coordinate plane across one axis, both axes, or the origin.

Understand the concept of opposite numbers, including zero, and their relative locations on the number line.

Understand that the signs of the coordinates in ordered pairs indicate their location on an axis or in a quadrant on the coordinate plane.

Recognize the differences between rational and irrational numbers.

Understand that all real numbers have a decimal expansion.

Model the hierarchy of the real number system, including natural, whole, integer, rational, and irrational numbers.

Estimate and compare the value of irrational numbers by plotting them on a number line.

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.

Extend the understanding of the number line to include all rational numbers and apply this concept to the coordinate plane.

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.

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.

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. Recognize opposite signs of numbers as indicating locations on opposite sides of 0 on the number line. Recognize that the opposite of the opposite of a number is the number itself, e.g., −(−3) = 3, and that 0 is its own opposite. Understand signs of numbers in ordered pairs as indicating locations in quadrants of the coordinate plane. Recognize that when two ordered pairs differ only by signs, the locations of the points are related by reflections across one or both axes. Find and position integers and other rational numbers on a horizontal or vertical number line diagram. Find and position pairs of integers and other rational numbers on a coordinate plane.