Solving Equations with One, Infinite, or No Solutions to watch on April 12 - https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-solving-equations/number-of-solutions-to-linear-equations/v/number-of-solutions-to-linear-equations
Order of Operations - https://www.mathsisfun.com/operation-order-pemdas.html
Substitution/Evaluate - https://www.mathsisfun.com/algebra/introduction.html
Scientific Notation and Standard Form - http://www.mathsisfun.com/numbers/scientific-notation.html
Exponents - http://www.mathsisfun.com/exponent.html
Squares and Square Roots - http://www.mathsisfun.com/square-root.html
Solving Equations - http://www.mathsisfun.com/algebra/equations-solving.html
Equations of A Straight Line - http://www.mathsisfun.com/equation_of_line.html
Pythagorean Theorem - http://www.mathsisfun.com/pythagoras.html