You know by which one is further but I think what you mean to ask is how do you know how much it's greater and if that's what you ment the the difference between the two arrows is the answer
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The number which is more to the right is greater (when the line is in its normal position).
what is the greatest or least from the number line negative or greater
the number on the right is the greater of two numbers
-8
If the number line has negative numbers to the left of zero and positive numbers to the right then the further you go to the right, the greater the numbers become.
point on the number line is greater than 0 but less than 2 = 1