When you ask "What number is halfway between 13 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=13 and Y=155.
To find the number halfway between 13 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 155 into our formula, we get:
(13 + 155)/2 = 84
Thus, the number halfway between 13 and 155 is 84.
To check that our answer is correct, we subtract 13 from 84 and subtract 84 from 155 and compare the two numbers:
84 - 13 = 71
155 - 84 = 71
As you can see, the halfway number is 71 higher than 13 and 71 lower than 155. Therefore, our halfway between answer of 84 above is correct.
Halfway Between
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Halfway Between 13 and 156
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