When you ask "What number is halfway between 69 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=69 and Y=691.
To find the number halfway between 69 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 691 into our formula, we get:
(69 + 691)/2 = 380
Thus, the number halfway between 69 and 691 is 380.
To check that our answer is correct, we subtract 69 from 380 and subtract 380 from 691 and compare the two numbers:
380 - 69 = 311
691 - 380 = 311
As you can see, the halfway number is 311 higher than 69 and 311 lower than 691. Therefore, our halfway between answer of 380 above is correct.
Halfway Between
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Halfway Between 69 and 692
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