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Sigma notation, often referred to as summation notation, can be used in many common situations. For example, it can be used to calculate the sum of deposits for a bank account. Banks add together all deposits and withdrawals to determine the current balance.
Samiha Z. Scientific notation is used to represent a very large amount or very small amount in shorter terms. To write the number 5,000,000,000,000,000,000,000 would take a lot of time and thus people, especially scientists, use scientific notation to shorten the number so it is faster and easier to read and write. So instead of writing 5,000,000,000,000,000,000,000 scientists would right : #5.0xx 10^21#.