
When you ask "What number is halfway between 70 and 200?" 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=200.

To find the number halfway between 70 and 200, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 200 into our formula, we get:
(70 + 200)/2 = 135
Thus, the number halfway between 70 and 200 is 135.
To check that our answer is correct, we subtract 70 from 135 and subtract 135 from 200 and compare the two numbers:
135 - 70 = 65
200 - 135 = 65
As you can see, the halfway number is 65 higher than 70 and 65 lower than 200. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 70 and 201
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