
When you ask "What number is halfway between 90 and 430?" 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=430.

To find the number halfway between 90 and 430, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 430 into our formula, we get:
(90 + 430)/2 = 260
Thus, the number halfway between 90 and 430 is 260.
To check that our answer is correct, we subtract 90 from 260 and subtract 260 from 430 and compare the two numbers:
260 - 90 = 170
430 - 260 = 170
As you can see, the halfway number is 170 higher than 90 and 170 lower than 430. Therefore, our halfway between answer of 260 above is correct.
Halfway Between
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Halfway Between 90 and 431
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