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# What is a number model in math?

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### Quick Answer

**A number model in math is a sentence that illustrates how the parts of a number story are related.** The equation may include addition, subtraction, division and multiplication and may be expressed as words or in number form.

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Number models expressed in number form include 6 + 7 = 13, 12 * 6 = 72 and 24 / 3 = 8. An example of a number model written in words would be, "The area of rectangle A is equal to the product of sides D and E." The same equation can be expressed in numbers as area = d * e.

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## What is a neutral number in math?

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Full Answer >**According to MathGoodies.com, zero is a neutral number or integer since it is neither negative nor positive.**Whole numbers to the right of zero, or greater than zero, are known as positive integers. Whole numbers to the left of zero, or less than zero, are known as negative integers.Filed Under: -
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## What is a prime number in math?

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Full Answer >**A prime number in math is an integer greater than 1 that is evenly divisible by only 1 and the number itself.**One is not considered a prime number, because prime numbers by definition have two factors, and the number 1 only has one factor: 1.Filed Under: -
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## What are "friendly numbers" in math?

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Full Answer >**Friendly numbers are individual numbers that make up part of what is known as a friendly pair.**Friendly numbers always come in sets of two, and they are known for having a positive density.Filed Under: -
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## Is zero an even number?

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Full Answer >**In math, zero is considered to be an even number.**In order to be even, a number must be able to be divided exactly by two. Zero qualifies because zero divided by two equals zero.Filed Under: