When you ask "What number is halfway between 78 and 435?" 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=435.
To find the number halfway between 78 and 435, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 435 into our formula, we get:
(78 + 435)/2 = 256.5
Thus, the number halfway between 78 and 435 is 256.5.
To check that our answer is correct, we subtract 78 from 256.5 and subtract 256.5 from 435 and compare the two numbers:
256.5 - 78 = 178.5
435 - 256.5 = 178.5
As you can see, the halfway number is 178.5 higher than 78 and 178.5 lower than 435. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 78 and 436
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