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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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## What does "inverse" mean in math?

A: In math, inverse is explained as the opposite in effect. An inverse function is one that reverses another function. If an inverse does exist for a function... Full Answer >Filed Under: -
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## What is a "digit" in math?

A: "Digits" are the symbols or characters used to represent a number visually. A number like five contains one digit, whereas a number like 555 contains three... Full Answer >Filed Under: -
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## What is a mean in math?

A: In math, the mean is the average of a set of numbers. To determine the mean, add all numbers in a set and take this answer and divide it by how many number... 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 re... Full Answer >Filed Under: