When you ask "What number is halfway between 4 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=4 and Y=155.
To find the number halfway between 4 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 155 into our formula, we get:
(4 + 155)/2 = 79.5
Thus, the number halfway between 4 and 155 is 79.5.
To check that our answer is correct, we subtract 4 from 79.5 and subtract 79.5 from 155 and compare the two numbers:
79.5 - 4 = 75.5
155 - 79.5 = 75.5
As you can see, the halfway number is 75.5 higher than 4 and 75.5 lower than 155. Therefore, our halfway between answer of 79.5 above is correct.
Halfway Between
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Halfway Between 4 and 156
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