When you ask "What number is halfway between 86 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=86 and Y=400.
To find the number halfway between 86 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 400 into our formula, we get:
(86 + 400)/2 = 243
Thus, the number halfway between 86 and 400 is 243.
To check that our answer is correct, we subtract 86 from 243 and subtract 243 from 400 and compare the two numbers:
243 - 86 = 157
400 - 243 = 157
As you can see, the halfway number is 157 higher than 86 and 157 lower than 400. Therefore, our halfway between answer of 243 above is correct.
Halfway Between
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Halfway Between 86 and 401
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