When you ask "What number is halfway between 90 and 100?" 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=100.
To find the number halfway between 90 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 100 into our formula, we get:
(90 + 100)/2 = 95
Thus, the number halfway between 90 and 100 is 95.
To check that our answer is correct, we subtract 90 from 95 and subtract 95 from 100 and compare the two numbers:
95 - 90 = 5
100 - 95 = 5
As you can see, the halfway number is 5 higher than 90 and 5 lower than 100. Therefore, our halfway between answer of 95 above is correct.
Halfway Between
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Halfway Between 90 and 101
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