When you ask "What number is halfway between 99 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=99 and Y=153.
To find the number halfway between 99 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 153 into our formula, we get:
(99 + 153)/2 = 126
Thus, the number halfway between 99 and 153 is 126.
To check that our answer is correct, we subtract 99 from 126 and subtract 126 from 153 and compare the two numbers:
126 - 99 = 27
153 - 126 = 27
As you can see, the halfway number is 27 higher than 99 and 27 lower than 153. Therefore, our halfway between answer of 126 above is correct.
Halfway Between
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Halfway Between 99 and 154
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