Simplifying numerical expressions

This unit is for Grade VII. We will learn how to solve the expressions. We know that the expressions are the numerals joined together with the help of different operators. When more than one operator appears in the expression and some fixed laws are not designed for which operation is to be performed first, we will get variety of outcomes for all the persons who operate the calculations. So we will set the pattern by which hierarchies of the operators are decided and we all get the symmetry of the output for any expression whichever is solved.  Simplifying numerical expressions is the planned and the systematic methods of calculating the mathematical expressions. The order of solving the equations is as follows: BODMAS, where we have,
B – Bracket or braces,
O- Of operation,
D- Division,
M- Multiplication,
A-Addition,
S- Subtraction,
It means that when we solve the mathematical expressions, we will first open the braces and so whichever expression appears in the braces will be solved first. Next step of solution includes the calculating an “of” operator.  After solving the operator of, we will take up all the division calculations in the expression. After completing division, comes multiplication of the terms which are joined by multiplication “*” operator. After multiplying, we will solve the operation of Addition of the terms in the expression and in the end is left the operator of subtraction, if any exist in the main given expression. Thus proceeding in the systematical way and following the steps of the calculation as explained above all the expressions will follow a set pattern and hence the results we get will be universally same, who so ever does it and whenever they are solved. (know more about cbse text books, here)

Thus we say that the above method of solving the equations will help us to get symmetry of outputs
In the next session we will discuss about inequalities.