**Algorithm** is a process or set of rules to be followed in calculations or other problem-solving operations.

**Algorithms** are the efficient ways to do math.

For example 90 divided by 5. We know that, answer for ^{90}/_{5 }= 18 Now the question is how do we get this answer?

Answer includes the following steps,

- First divide 9 by 5
- How many times does 5 go into 9?
- A: only once = 1
- What is remainder when 9 is divided by 5?
- it is 4
- Put that 4 in front of 2 (in 90), it will be 40
- how many times does 5 goes into 40?
- A: 8
- Therefore the answer is 18 when 90 is dived by 5 with remainder 1.

This is called **Algorithm.**

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