When you ask "What number is halfway between 100 and 225?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=225.
To find the number halfway between 100 and 225, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 225 into our formula, we get:
(100 + 225)/2 = 162.5
Thus, the number halfway between 100 and 225 is 162.5.
To check that our answer is correct, we subtract 100 from 162.5 and subtract 162.5 from 225 and compare the two numbers:
162.5 - 100 = 62.5
225 - 162.5 = 62.5
As you can see, the halfway number is 62.5 higher than 100 and 62.5 lower than 225. Therefore, our halfway between answer of 162.5 above is correct.
Halfway Between
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Halfway Between 100 and 226
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