When you ask "What number is halfway between 9 and 210?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=210.
To find the number halfway between 9 and 210, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 210 into our formula, we get:
(9 + 210)/2 = 109.5
Thus, the number halfway between 9 and 210 is 109.5.
To check that our answer is correct, we subtract 9 from 109.5 and subtract 109.5 from 210 and compare the two numbers:
109.5 - 9 = 100.5
210 - 109.5 = 100.5
As you can see, the halfway number is 100.5 higher than 9 and 100.5 lower than 210. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 9 and 211
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