When you ask "What number is halfway between 71 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=71 and Y=155.
To find the number halfway between 71 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 155 into our formula, we get:
(71 + 155)/2 = 113
Thus, the number halfway between 71 and 155 is 113.
To check that our answer is correct, we subtract 71 from 113 and subtract 113 from 155 and compare the two numbers:
113 - 71 = 42
155 - 113 = 42
As you can see, the halfway number is 42 higher than 71 and 42 lower than 155. Therefore, our halfway between answer of 113 above is correct.
Halfway Between
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Halfway Between 71 and 156
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