When you ask "What number is halfway between 42 and 99?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=99.
To find the number halfway between 42 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 99 into our formula, we get:
(42 + 99)/2 = 70.5
Thus, the number halfway between 42 and 99 is 70.5.
To check that our answer is correct, we subtract 42 from 70.5 and subtract 70.5 from 99 and compare the two numbers:
70.5 - 42 = 28.5
99 - 70.5 = 28.5
As you can see, the halfway number is 28.5 higher than 42 and 28.5 lower than 99. Therefore, our halfway between answer of 70.5 above is correct.
Halfway Between
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Halfway Between 42 and 100
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