When you ask "What number is halfway between 57 and 153?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=57 and Y=153.
To find the number halfway between 57 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 153 into our formula, we get:
(57 + 153)/2 = 105
Thus, the number halfway between 57 and 153 is 105.
To check that our answer is correct, we subtract 57 from 105 and subtract 105 from 153 and compare the two numbers:
105 - 57 = 48
153 - 105 = 48
As you can see, the halfway number is 48 higher than 57 and 48 lower than 153. Therefore, our halfway between answer of 105 above is correct.
Halfway Between
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Halfway Between 57 and 154
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