When you ask "What number is halfway between 99 and 106?" 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=106.
To find the number halfway between 99 and 106, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 106 into our formula, we get:
(99 + 106)/2 = 102.5
Thus, the number halfway between 99 and 106 is 102.5.
To check that our answer is correct, we subtract 99 from 102.5 and subtract 102.5 from 106 and compare the two numbers:
102.5 - 99 = 3.5
106 - 102.5 = 3.5
As you can see, the halfway number is 3.5 higher than 99 and 3.5 lower than 106. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 99 and 107
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