When you ask "What number is halfway between 10 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=10 and Y=423.
To find the number halfway between 10 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 423 into our formula, we get:
(10 + 423)/2 = 216.5
Thus, the number halfway between 10 and 423 is 216.5.
To check that our answer is correct, we subtract 10 from 216.5 and subtract 216.5 from 423 and compare the two numbers:
216.5 - 10 = 206.5
423 - 216.5 = 206.5
As you can see, the halfway number is 206.5 higher than 10 and 206.5 lower than 423. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 10 and 424
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