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# Category: Numbers

link to What Is The Fibonacci Sequence? (3 Key Ideas)
link to What Is A Cube Root? (7 Common Questions Answered)
link to How To Calculate Percentages In Excel (Plus 5 Helpful Tips)
link to What Is A Factorial? (3 Key Concepts To Learn)
link to That Thing About e (What Is e? Plus 4 Key Concepts To Know)
link to Adding, Multiplying, & Dividing Square Roots (3 Key Operations)

Perhaps you remember problems like the following from standardized tests: Find the next two numbers in the given sequences: {3, 7, 11, 15, ___ , ____ }{1, 5, 25, 125, ___ , ____ } Do these...

A cube root can help us to find the side length of a cube with a given volume. A cube root can also help us to solve cubic equations (where there is an x3 term). However, it still helps...

Finding percentages helps us to understand how values are increasing or decreasing over time (among other things). Microsoft Excel can find the percentages for any pair of values (numerator and...

Factorials are useful throughout mathematics: they are found in binomial coefficients, combinatorics, probability distributions, power series expansions (for ex, sin(x), and cos(x)) and the gamma...

What’s the deal with the number e? Do we really need another irrational number that has its own key on most calculators? Isn’t π enough? Usually, the number e gets introduced to us when we...

Adding, Multiplying, & Dividing Square Roots (3 Key Operations)

Adding, multiplying and dividing square roots are important skills for algebra, geometry, and calculus courses. The rules are a little different for each of these three operations,...