When you ask "What number is halfway between 70 and 909?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=70 and Y=909.
To find the number halfway between 70 and 909, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 909 into our formula, we get:
(70 + 909)/2 = 489.5
Thus, the number halfway between 70 and 909 is 489.5.
To check that our answer is correct, we subtract 70 from 489.5 and subtract 489.5 from 909 and compare the two numbers:
489.5 - 70 = 419.5
909 - 489.5 = 419.5
As you can see, the halfway number is 419.5 higher than 70 and 419.5 lower than 909. Therefore, our halfway between answer of 489.5 above is correct.
Halfway Between
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Halfway Between 70 and 910
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