SAT math problem without calculator | fraction manipulation without long division

An algebra problem from Harvard-MIT mathematics tournament.

Simplifying the difference of two square roots

Another not so difficult problem in Putnam (and it is not the first question in the session!)

Another not so difficult Putnam problem

Solving system of linear equations | A re-introduction of the method of elimination

A relatively easy problem from the #Putnam mathematical competition

Squaring a number ending in 5 | Answer to mental math challenge and the mathematical explanation

#SAT #math without calculator for a #quadratic equation

SAT math problem without calculator | fraction manipulation without long division

A Harvard-MIT mathematics tournament question | algebra, geometry, polar coordinates, derivatives

Another SAT complex number problem

Rice Mathematics competition - infinite sum of telescopic series with partial fraction decomposition