When you ask "What number is halfway between 42 and 172?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=172.
To find the number halfway between 42 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 172 into our formula, we get:
(42 + 172)/2 = 107
Thus, the number halfway between 42 and 172 is 107.
To check that our answer is correct, we subtract 42 from 107 and subtract 107 from 172 and compare the two numbers:
107 - 42 = 65
172 - 107 = 65
As you can see, the halfway number is 65 higher than 42 and 65 lower than 172. Therefore, our halfway between answer of 107 above is correct.
Halfway Between
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Halfway Between 42 and 173
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