When you ask "What number is halfway between 87 and 658?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=658.
To find the number halfway between 87 and 658, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 658 into our formula, we get:
(87 + 658)/2 = 372.5
Thus, the number halfway between 87 and 658 is 372.5.
To check that our answer is correct, we subtract 87 from 372.5 and subtract 372.5 from 658 and compare the two numbers:
372.5 - 87 = 285.5
658 - 372.5 = 285.5
As you can see, the halfway number is 285.5 higher than 87 and 285.5 lower than 658. Therefore, our halfway between answer of 372.5 above is correct.
Halfway Between
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Halfway Between 87 and 659
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