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There are four basic properties of numbers: commutative, associative, distributive, and identity. You should be familiar with each of these. It is especially important to understand these properties once you reach advanced math such as algebra and calculus.
Commutative Property
a. Addition. When two numbers are added, the sum is the same regardless of the order in [...]

A hundred years ago, school children read often and well, mainly because there was little else to do except rely on their imaginations. Consequently, they grew up to be prolific readers, writers, and thinkers, contributing to a 20th century America that became great and strong as a global leader.
Today many school children not only do [...]