A number line is a simple, affordable and incredibly valuable mathematical teaching tool. When students begin to learn math, they develop number sense. Number sense is the understanding of what numbers are and how they relate to each other. A student who knows that six is a larger number than four has a basic concept of number sense. Number lines provide students with a concrete representation of the number system. When students first begin counting or start to learn the basic operations of addition and subtraction, number lines can help them compare the values of numbers as well as remember the order of the digits.
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