When you ask "What number is halfway between 90 and 207?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=207.
To find the number halfway between 90 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 207 into our formula, we get:
(90 + 207)/2 = 148.5
Thus, the number halfway between 90 and 207 is 148.5.
To check that our answer is correct, we subtract 90 from 148.5 and subtract 148.5 from 207 and compare the two numbers:
148.5 - 90 = 58.5
207 - 148.5 = 58.5
As you can see, the halfway number is 58.5 higher than 90 and 58.5 lower than 207. Therefore, our halfway between answer of 148.5 above is correct.
Halfway Between
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Halfway Between 90 and 208
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