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No number lines are infinite in length. If you have a section of the line, a segment, then the midpoint is the average of the lower and the higher value:

(L> + H) / 2

(Lower value plus higher value divided by two)

Note that if either of the values is less than zero you will have to think a little harder to get the absolute distance between them!

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Q: How do you find the midpoint on a number line?
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