When you ask "What number is halfway between 1 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=1 and Y=220.
To find the number halfway between 1 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 220 into our formula, we get:
(1 + 220)/2 = 110.5
Thus, the number halfway between 1 and 220 is 110.5.
To check that our answer is correct, we subtract 1 from 110.5 and subtract 110.5 from 220 and compare the two numbers:
110.5 - 1 = 109.5
220 - 110.5 = 109.5
As you can see, the halfway number is 109.5 higher than 1 and 109.5 lower than 220. Therefore, our halfway between answer of 110.5 above is correct.
Halfway Between
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Halfway Between 1 and 221
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