Excel is based on mathematics and functional calculations.
It helps to calculate the results of functions in an instant. You don't even need a calculator or a long diary to do the complex calculations, and you just need to understand how to write the formulas correctly.
Here are some examples:
Example 1
Example 2
(Photo credits: Internet serch documents on Excel learning)
Once you start learning Excel you can not go back to calculators. Excel is addictive.
Now a days, you can use MS Excel or Google Sheets that have utilised the powerful mathematics easy and fun.
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Enjoy !