Video lessons and exercises from Khan AcademySupports the following Standards of Mathematical Practice• 1 Make sense of problems and persevere in solving them.• 2 Reason abstractly and quantitatively.• 3 Construct viable arguments and critique the reasoning of others.• 5 Use appropriate tools strategically.• 6 Attend to precision.• 7 Look for and make use of structure.• 8 Look for and express regularity in repeated reasoning.