The short version To round a number, find the place you’re rounding to, then look at the single digit to its right. If that digit is 5 or more, round up. If it’s 4 or less, keep the rounding digit the same. Everything to the right of the rounding place turns into zeros. Nothing to…
The short version In school math, mean vs average is mostly a vocabulary question. When a worksheet says “average,” it almost always wants the mean: add the numbers, divide by how many there are. “Average” is the wider word. It covers any single number used to stand in for a whole set, which includes the…
The short version A function in math is a rule that takes an input and gives back exactly one output. Same input, same answer, every single time. The one output rule is the whole test. If one input can produce two different outputs, the rule isn’t a function. f(x) is a name, not a multiplication….
The short version Euclid was a Greek mathematician who taught in Alexandria, Egypt around 300 BCE. He’s called the father of geometry because of one book. That book, the Elements, is a 13 volume set that gathers the geometry and number theory known at the time and arranges it so every result is proved from…
The short version In math, per means “for each” or “for every,” and it tells you to divide. The order is fixed: “A per B” means A divided by B. Miles per hour is miles divided by hours, so 180 miles in 3 hours works out to 180 ÷ 3 = 60 mph. The answer…