When you ask "What number is halfway between 21 and 193?" 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=193.
To find the number halfway between 21 and 193, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 193 into our formula, we get:
(21 + 193)/2 = 107
Thus, the number halfway between 21 and 193 is 107.
To check that our answer is correct, we subtract 21 from 107 and subtract 107 from 193 and compare the two numbers:
107 - 21 = 86
193 - 107 = 86
As you can see, the halfway number is 86 higher than 21 and 86 lower than 193. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 21 and 194
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