When you ask "What number is halfway between 30 and 657?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=657.
To find the number halfway between 30 and 657, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 657 into our formula, we get:
(30 + 657)/2 = 343.5
Thus, the number halfway between 30 and 657 is 343.5.
To check that our answer is correct, we subtract 30 from 343.5 and subtract 343.5 from 657 and compare the two numbers:
343.5 - 30 = 313.5
657 - 343.5 = 313.5
As you can see, the halfway number is 313.5 higher than 30 and 313.5 lower than 657. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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Halfway Between 30 and 658
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