standard_description: Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 < 1/2.
problem_activity: Label the second quadrant on the coordinate plane, and then answer the following questions.
[IMG]
a.   Write the coordinates of one point that lies in the second quadrant of the coordinate plane.
b.    What must be true about the coordinates of any point that lies in the second quadrant?
c.    Plot and label the following points:
$${A: (-4, 6)}$$
$${B: (6, -4)}$$
$${C: (0, -2)}$$
$${D: (2, 0)}$$
$${E: (-5, -3)}$$


aligns: no