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28 x 2 = 56
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
Oh, dude, math time! So, if 20 is 50% of a number, that means the number is double 20, which is 40. It's like when you buy one, get one free - except in this case, you only get half off. Math can be fun, right?
the purpose of a number line is to help math.
It is a composite number.