When you ask "What number is halfway between 7 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=7 and Y=155.
To find the number halfway between 7 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 155 into our formula, we get:
(7 + 155)/2 = 81
Thus, the number halfway between 7 and 155 is 81.
To check that our answer is correct, we subtract 7 from 81 and subtract 81 from 155 and compare the two numbers:
81 - 7 = 74
155 - 81 = 74
As you can see, the halfway number is 74 higher than 7 and 74 lower than 155. Therefore, our halfway between answer of 81 above is correct.
Halfway Between
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Halfway Between 7 and 156
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