When you ask "What number is halfway between 2 and 143?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=2 and Y=143.
To find the number halfway between 2 and 143, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 2 and 143 into our formula, we get:
(2 + 143)/2 = 72.5
Thus, the number halfway between 2 and 143 is 72.5.
To check that our answer is correct, we subtract 2 from 72.5 and subtract 72.5 from 143 and compare the two numbers:
72.5 - 2 = 70.5
143 - 72.5 = 70.5
As you can see, the halfway number is 70.5 higher than 2 and 70.5 lower than 143. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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Halfway Between 2 and 144
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