When you ask "What number is halfway between 10 and 220?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=220.
To find the number halfway between 10 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 220 into our formula, we get:
(10 + 220)/2 = 115
Thus, the number halfway between 10 and 220 is 115.
To check that our answer is correct, we subtract 10 from 115 and subtract 115 from 220 and compare the two numbers:
115 - 10 = 105
220 - 115 = 105
As you can see, the halfway number is 105 higher than 10 and 105 lower than 220. Therefore, our halfway between answer of 115 above is correct.
Halfway Between
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Halfway Between 10 and 221
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