When you ask "What number is halfway between 51 and 486?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=51 and Y=486.
To find the number halfway between 51 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 486 into our formula, we get:
(51 + 486)/2 = 268.5
Thus, the number halfway between 51 and 486 is 268.5.
To check that our answer is correct, we subtract 51 from 268.5 and subtract 268.5 from 486 and compare the two numbers:
268.5 - 51 = 217.5
486 - 268.5 = 217.5
As you can see, the halfway number is 217.5 higher than 51 and 217.5 lower than 486. Therefore, our halfway between answer of 268.5 above is correct.
Halfway Between
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Halfway Between 51 and 487
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