When you ask "What number is halfway between 66 and 102?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=66 and Y=102.
To find the number halfway between 66 and 102, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 102 into our formula, we get:
(66 + 102)/2 = 84
Thus, the number halfway between 66 and 102 is 84.
To check that our answer is correct, we subtract 66 from 84 and subtract 84 from 102 and compare the two numbers:
84 - 66 = 18
102 - 84 = 18
As you can see, the halfway number is 18 higher than 66 and 18 lower than 102. Therefore, our halfway between answer of 84 above is correct.
Halfway Between
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Halfway Between 66 and 103
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