When you ask "What number is halfway between 66 and 691?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=66 and Y=691.
To find the number halfway between 66 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 691 into our formula, we get:
(66 + 691)/2 = 378.5
Thus, the number halfway between 66 and 691 is 378.5.
To check that our answer is correct, we subtract 66 from 378.5 and subtract 378.5 from 691 and compare the two numbers:
378.5 - 66 = 312.5
691 - 378.5 = 312.5
As you can see, the halfway number is 312.5 higher than 66 and 312.5 lower than 691. Therefore, our halfway between answer of 378.5 above is correct.
Halfway Between
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Halfway Between 66 and 692
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