When you ask "What number is halfway between 21 and 183?" 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=183.
To find the number halfway between 21 and 183, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 183 into our formula, we get:
(21 + 183)/2 = 102
Thus, the number halfway between 21 and 183 is 102.
To check that our answer is correct, we subtract 21 from 102 and subtract 102 from 183 and compare the two numbers:
102 - 21 = 81
183 - 102 = 81
As you can see, the halfway number is 81 higher than 21 and 81 lower than 183. Therefore, our halfway between answer of 102 above is correct.
Halfway Between
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Halfway Between 21 and 184
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