When you ask "What number is halfway between 4 and 153?" 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=153.
To find the number halfway between 4 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 153 into our formula, we get:
(4 + 153)/2 = 78.5
Thus, the number halfway between 4 and 153 is 78.5.
To check that our answer is correct, we subtract 4 from 78.5 and subtract 78.5 from 153 and compare the two numbers:
78.5 - 4 = 74.5
153 - 78.5 = 74.5
As you can see, the halfway number is 74.5 higher than 4 and 74.5 lower than 153. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 4 and 154
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