When you ask "What number is halfway between 28 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=28 and Y=153.
To find the number halfway between 28 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 153 into our formula, we get:
(28 + 153)/2 = 90.5
Thus, the number halfway between 28 and 153 is 90.5.
To check that our answer is correct, we subtract 28 from 90.5 and subtract 90.5 from 153 and compare the two numbers:
90.5 - 28 = 62.5
153 - 90.5 = 62.5
As you can see, the halfway number is 62.5 higher than 28 and 62.5 lower than 153. Therefore, our halfway between answer of 90.5 above is correct.
Halfway Between
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Halfway Between 28 and 154
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