Keywords: expression number, expression, numerology, number, master number, singledigit number, core numbers, singledigit
Famous mathematicians believe that the mathematical model is a tool to understand the universe. From the number of elements to the number of stars, we attribute numbers to explain the patterns that exist in the universe.
Scientists and mathematicians use math expressions to establish and prove such relationships.
The concept of expression number uses the technique of assignment of singledigit numbers (1 to 9) to the English alphabet from A to Z. The next section highlights the key developments in mathematics using such number patterns.
Using the above chart, the master number for a name, term or date is evaluated. The singledigit reduction of a given date is the sum of all the numbers until it reaches to a number less than 9.
Considering the name “Tesla” as an example, the expression number will be:
= Tesla = 2 + 5 + 1 + 3 + 1
= 12
= 1 + 2
= 3
For example, consider the date, 10/06/1982. The single digit reduction will be:
= 10/06/1982
= 1 + 0 + 0 + 6 + 1 + 9 + 8 +2
= 27
= 2 + 7
= 9
Thus, the expression number for the given date is 9.
The concept of digit sum arithmetic is based on expression number. The divisibility properties of numbers are proven using digit sum arithmetic. It is also useful in checking the divisibility of numbers by 3 and 9.
For example, to test whether the number 216 is divisible by 3 and 9, let’s find the digit sum first as follows.
= 216
= 2 + 1 + 6
= 9
= 9 ÷ 3 = 3 with remainder 0
= Also, 216 ÷ 9 = 24 with remainder 0
Thus, the number is divisible by 3 and 9.
“Modular 9” arithmetic uses the concept of reduction of numbers to singledigit numbers (as digit sum) for studying math axioms. Several statistical models and tests use math expressions to study the behavior of quantitative data from fields like agriculture, finance, economics, and banking. In computer science, the digit sum of binary (base2) numbers is used to evaluate Hamming weight.
Fun Facts

Expression
Arithmetic operators
Rational expression
Master number