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In the middle of a number line you need to put a zero and on the right hand its always positive and on the left hand side its always negative
In a number line you need to use addition for the positive side only because on the negative side its only for if you minus a number example 5+6 that equals 11.
We don't use multiplication on a number line that much but multiplication is used for skip counting numbers example 30 skip count to 50 and then you keep going and then stop when you need to.
So these are the four things that we use for maths and counting.
So in a number line you need to always move left to subtract example 7-2 equals five and that how you get the answer of subtracting.
Division is the same thing as multiplication because you multiply and for division you kind of do the same thing, here is an example 6 divide 1 equals 6