When you ask "What number is halfway between 42 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=42 and Y=400.
To find the number halfway between 42 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 400 into our formula, we get:
(42 + 400)/2 = 221
Thus, the number halfway between 42 and 400 is 221.
To check that our answer is correct, we subtract 42 from 221 and subtract 221 from 400 and compare the two numbers:
221 - 42 = 179
400 - 221 = 179
As you can see, the halfway number is 179 higher than 42 and 179 lower than 400. Therefore, our halfway between answer of 221 above is correct.
Halfway Between
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Halfway Between 42 and 401
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