When you ask "What number is halfway between 78 and 537?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=537.
To find the number halfway between 78 and 537, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 537 into our formula, we get:
(78 + 537)/2 = 307.5
Thus, the number halfway between 78 and 537 is 307.5.
To check that our answer is correct, we subtract 78 from 307.5 and subtract 307.5 from 537 and compare the two numbers:
307.5 - 78 = 229.5
537 - 307.5 = 229.5
As you can see, the halfway number is 229.5 higher than 78 and 229.5 lower than 537. Therefore, our halfway between answer of 307.5 above is correct.
Halfway Between
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Halfway Between 78 and 538
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