When you ask "What number is halfway between 90 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=90 and Y=400.
To find the number halfway between 90 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 400 into our formula, we get:
(90 + 400)/2 = 245
Thus, the number halfway between 90 and 400 is 245.
To check that our answer is correct, we subtract 90 from 245 and subtract 245 from 400 and compare the two numbers:
245 - 90 = 155
400 - 245 = 155
As you can see, the halfway number is 155 higher than 90 and 155 lower than 400. Therefore, our halfway between answer of 245 above is correct.
Halfway Between
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Halfway Between 90 and 401
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