When you ask "What number is halfway between 100 and 400?" 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=400.
To find the number halfway between 100 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 400 into our formula, we get:
(100 + 400)/2 = 250
Thus, the number halfway between 100 and 400 is 250.
To check that our answer is correct, we subtract 100 from 250 and subtract 250 from 400 and compare the two numbers:
250 - 100 = 150
400 - 250 = 150
As you can see, the halfway number is 150 higher than 100 and 150 lower than 400. Therefore, our halfway between answer of 250 above is correct.
Halfway Between
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Halfway Between 100 and 401
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