When you ask "What number is halfway between 99 and 135?" 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=135.
To find the number halfway between 99 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 135 into our formula, we get:
(99 + 135)/2 = 117
Thus, the number halfway between 99 and 135 is 117.
To check that our answer is correct, we subtract 99 from 117 and subtract 117 from 135 and compare the two numbers:
117 - 99 = 18
135 - 117 = 18
As you can see, the halfway number is 18 higher than 99 and 18 lower than 135. Therefore, our halfway between answer of 117 above is correct.
Halfway Between
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Halfway Between 99 and 136
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