When you ask "What number is halfway between 90 and 507?" 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=507.
To find the number halfway between 90 and 507, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 507 into our formula, we get:
(90 + 507)/2 = 298.5
Thus, the number halfway between 90 and 507 is 298.5.
To check that our answer is correct, we subtract 90 from 298.5 and subtract 298.5 from 507 and compare the two numbers:
298.5 - 90 = 208.5
507 - 298.5 = 208.5
As you can see, the halfway number is 208.5 higher than 90 and 208.5 lower than 507. Therefore, our halfway between answer of 298.5 above is correct.
Halfway Between
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Halfway Between 90 and 508
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