When you ask "What number is halfway between 21 and 235?" 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=235.
To find the number halfway between 21 and 235, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 235 into our formula, we get:
(21 + 235)/2 = 128
Thus, the number halfway between 21 and 235 is 128.
To check that our answer is correct, we subtract 21 from 128 and subtract 128 from 235 and compare the two numbers:
128 - 21 = 107
235 - 128 = 107
As you can see, the halfway number is 107 higher than 21 and 107 lower than 235. Therefore, our halfway between answer of 128 above is correct.
Halfway Between
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Halfway Between 21 and 236
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