When you ask "What number is halfway between 57 and 155?" 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=155.
To find the number halfway between 57 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 155 into our formula, we get:
(57 + 155)/2 = 106
Thus, the number halfway between 57 and 155 is 106.
To check that our answer is correct, we subtract 57 from 106 and subtract 106 from 155 and compare the two numbers:
106 - 57 = 49
155 - 106 = 49
As you can see, the halfway number is 49 higher than 57 and 49 lower than 155. Therefore, our halfway between answer of 106 above is correct.
Halfway Between
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Halfway Between 57 and 156
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