Research shows tackling the hardest problems first could better teach children new skills
Common wisdom dictates that in order to learn a complicated skill, it is best to break the skill down into parts, conquer simpler steps first, and then incrementally move forward, eventually getting to the hard stuff. For example, you don't just tackle a multivariable equation, you start with easier examples. First, you learn to add, subtract, multiply and divide. Then, you learn how to solve 2x=8, then x + y = 7, and so on and so forth until you are aptly equipped to solve 2(5x + z) = 30x + 3y + 10.