When you ask "What number is halfway between 49 and 642?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=49 and Y=642.
To find the number halfway between 49 and 642, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 49 and 642 into our formula, we get:
(49 + 642)/2 = 345.5
Thus, the number halfway between 49 and 642 is 345.5.
To check that our answer is correct, we subtract 49 from 345.5 and subtract 345.5 from 642 and compare the two numbers:
345.5 - 49 = 296.5
642 - 345.5 = 296.5
As you can see, the halfway number is 296.5 higher than 49 and 296.5 lower than 642. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 49 and 643
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