Math topic
Number Systems
Explore scientific notation, irrational numbers, square roots, e, and the complex number system.
Guides
Learn number systems
Number Systems
Scientific Notation
Write very large and very small values as a coefficient times a power of ten and calculate with them correctly.
Number Systems
Rational and Irrational Numbers
Distinguish rational and irrational real numbers using fractions, decimal patterns, roots, and examples.
Number Systems
Euler's Number e
Understand the constant e through continuous growth, limits, exponentials, and natural logarithms.
Number Systems
Square Roots and Irrational Numbers
Simplify square roots, identify perfect-square factors, and understand when a root is irrational.
Number Systems
Complex Numbers
Learn rectangular and polar forms, arithmetic, conjugates, modulus, and how complex numbers extend the real line.
Number Systems
The Imaginary Unit i
Learn why i is defined by i squared equals -1, how its powers cycle, and how it solves negative-root equations.
Practice and verify