When you ask "What number is halfway between 100 and 427?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=427.
To find the number halfway between 100 and 427, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 427 into our formula, we get:
(100 + 427)/2 = 263.5
Thus, the number halfway between 100 and 427 is 263.5.
To check that our answer is correct, we subtract 100 from 263.5 and subtract 263.5 from 427 and compare the two numbers:
263.5 - 100 = 163.5
427 - 263.5 = 163.5
As you can see, the halfway number is 163.5 higher than 100 and 163.5 lower than 427. Therefore, our halfway between answer of 263.5 above is correct.
Halfway Between
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Halfway Between 100 and 428
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