When you ask "What number is halfway between 21 and 236?" 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=236.
To find the number halfway between 21 and 236, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 236 into our formula, we get:
(21 + 236)/2 = 128.5
Thus, the number halfway between 21 and 236 is 128.5.
To check that our answer is correct, we subtract 21 from 128.5 and subtract 128.5 from 236 and compare the two numbers:
128.5 - 21 = 107.5
236 - 128.5 = 107.5
As you can see, the halfway number is 107.5 higher than 21 and 107.5 lower than 236. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 21 and 237
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