When you ask "What number is halfway between 21 and 526?" 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=526.
To find the number halfway between 21 and 526, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 526 into our formula, we get:
(21 + 526)/2 = 273.5
Thus, the number halfway between 21 and 526 is 273.5.
To check that our answer is correct, we subtract 21 from 273.5 and subtract 273.5 from 526 and compare the two numbers:
273.5 - 21 = 252.5
526 - 273.5 = 252.5
As you can see, the halfway number is 252.5 higher than 21 and 252.5 lower than 526. Therefore, our halfway between answer of 273.5 above is correct.
Halfway Between
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Halfway Between 21 and 527
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