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Numbers allows us to express and compare magnitudes and quantities.
A number can be written in many different ways. For example, all of these expressions and numerals represent the same number:
$$ 4 \qquad 1\times 4 \qquad 4.00 \qquad \text{four} \qquad 3+1 \qquad \frac{28}{7} \qquad \sqrt{16} \qquad \sqrt[\footnotesize 3]{64} \qquad (-4)Γ(-1) \qquad 3.99β¦ \qquad 2^2 \newline \text{\huge β} \qquad \texttt{0b100} \qquad \text{11}_3 \qquad \text{β £} \qquad \text{π£} \qquad \text{π} \qquad \text{β } \qquad \text{ΞΚΉ} \qquad \text{ε} \qquad \text{λ·} \qquad \text{Ω€} \qquad \text{Χ} \qquad \text{α€} \qquad \text{π} \qquad \text{ΰ§ͺ} \qquad $$