10 units.
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If we are talking whole numbers, then 9 is between 8 and 10. But if you have a number line measure in tenths (decimals), then 9 is between 8.9 and 9.1. If the number line is in halves, then 9 coms in between 8 and a half and 9 and a half. There are lots of answers. It just depends on the scale of the number line.
The number line from 1 to 10 includes 10 integers, but an infinite number of real numbers.
The distance along a straight line is 10. Using the Pythagorean equation, c2 = a2 + b2 where the x change is 6 and the y change is 8, c2 = 62 + 82 = 36 + 64 = 100 c = [sqrt 100] = 10
Somewhere between 9 and 10, cut closer to 10 than 9 - exactly seven tenths of the way from 9 to 10.
The numbers between 8 and 11 are 9 and 10. These numbers fall between 8 and 11 on the number line and are considered consecutive integers. In mathematical terms, they are part of the set {9, 10}.