When you ask "What number is halfway between 99 and 423?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=423.
To find the number halfway between 99 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 423 into our formula, we get:
(99 + 423)/2 = 261
Thus, the number halfway between 99 and 423 is 261.
To check that our answer is correct, we subtract 99 from 261 and subtract 261 from 423 and compare the two numbers:
261 - 99 = 162
423 - 261 = 162
As you can see, the halfway number is 162 higher than 99 and 162 lower than 423. Therefore, our halfway between answer of 261 above is correct.
Halfway Between
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Halfway Between 99 and 424
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