When you ask "What number is halfway between 90 and 172?" 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=172.
To find the number halfway between 90 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 172 into our formula, we get:
(90 + 172)/2 = 131
Thus, the number halfway between 90 and 172 is 131.
To check that our answer is correct, we subtract 90 from 131 and subtract 131 from 172 and compare the two numbers:
131 - 90 = 41
172 - 131 = 41
As you can see, the halfway number is 41 higher than 90 and 41 lower than 172. Therefore, our halfway between answer of 131 above is correct.
Halfway Between
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Halfway Between 90 and 173
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