When you ask "What number is halfway between 21 and 208?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=208.
To find the number halfway between 21 and 208, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 208 into our formula, we get:
(21 + 208)/2 = 114.5
Thus, the number halfway between 21 and 208 is 114.5.
To check that our answer is correct, we subtract 21 from 114.5 and subtract 114.5 from 208 and compare the two numbers:
114.5 - 21 = 93.5
208 - 114.5 = 93.5
As you can see, the halfway number is 93.5 higher than 21 and 93.5 lower than 208. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 21 and 209
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