Everything surrounded by us is connected with numbers, In simple way Nos are Input & output to Mathematical formula. Numbers are starting from 0 to 9 which is 0, 1, 2, 3, 4, 5, 6, 7, 8 & 9. It will grow infinitely which cannot have any END.

In general Numbers are divided into 2 types namely Integers, Decimals, Fractions & Percentages

Say for Example:-