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What is a summary number model

What is a summary number model-example-1
User Andrewk
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a number model is a sentence that illustrate how the parts of a number story related 
User Lostlinkpr
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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.
User David Morrow
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