Math number models are tools used to develop computational strategies.
Number models are often shown using physical representations such as: Base10 blocks, Ten Frames, Open Number Lines or a Number Grid amongst others.
Using these models teachers can demonstrate various strategies such as "doubles".
The problem 12+13 can be thought of as a "double" of 10 then 3+2
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the purpose of a number line is to help math.
It is a composite number.
It is a composite number.
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The number above the line.