When you ask "What number is halfway between 20 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=20 and Y=102.
To find the number halfway between 20 and 102, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 102 into our formula, we get:
(20 + 102)/2 = 61
Thus, the number halfway between 20 and 102 is 61.
To check that our answer is correct, we subtract 20 from 61 and subtract 61 from 102 and compare the two numbers:
61 - 20 = 41
102 - 61 = 41
As you can see, the halfway number is 41 higher than 20 and 41 lower than 102. Therefore, our halfway between answer of 61 above is correct.
Halfway Between
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Halfway Between 20 and 103
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