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# What is mental math?

**Calculations that a person does in his head without the use of external aids is called mental math.** It is the most common form of calculation in daily life, as it can quickly perform simple calculations and estimations.

Mental math uses facts about numbers that have been committed to memory. Such facts may include multiplication tables and relationships between numbers. For example, a student solving 86 x 5 might find it quicker to calculate the solution to (86 ÷ 2) x 10 than to write out the algorithmic process. Mental math is practiced in various ways, including finding different ways to calculate a given number.

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Q:
## What does "sum" mean in math?

A: In mathematics, adding numbers, items or amounts produces a sum. The word also refers to a group of arithmetic problems given as a classroom assignment. As... Full Answer >Filed Under: -
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## What does "evaluate" mean in math?

A: In mathematics, the word "evaluate" is a verb that refers to finding or calculating the value of something. This can pertain to financial mathematics or to... Full Answer >Filed Under: -
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## What does "exp" mean in math?

A: In mathematics, the abbreviation "exp" stands for the word exponent. An exponent is a number placed after another number to indicate the power to which the... Full Answer >Filed Under: -
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## What is regrouping in math?

A: Regrouping is the borrowing of a value from one column of numbers to another to aid a mathematical operation. If one is subtracting, it’s necessary to regr... Full Answer >Filed Under: