When you ask "What number is halfway between 7 and 211?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=211.
To find the number halfway between 7 and 211, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 211 into our formula, we get:
(7 + 211)/2 = 109
Thus, the number halfway between 7 and 211 is 109.
To check that our answer is correct, we subtract 7 from 109 and subtract 109 from 211 and compare the two numbers:
109 - 7 = 102
211 - 109 = 102
As you can see, the halfway number is 102 higher than 7 and 102 lower than 211. Therefore, our halfway between answer of 109 above is correct.
Halfway Between
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Halfway Between 7 and 212
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