When you ask "What number is halfway between 70 and 207?" 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=207.
To find the number halfway between 70 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 207 into our formula, we get:
(70 + 207)/2 = 138.5
Thus, the number halfway between 70 and 207 is 138.5.
To check that our answer is correct, we subtract 70 from 138.5 and subtract 138.5 from 207 and compare the two numbers:
138.5 - 70 = 68.5
207 - 138.5 = 68.5
As you can see, the halfway number is 68.5 higher than 70 and 68.5 lower than 207. Therefore, our halfway between answer of 138.5 above is correct.
Halfway Between
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Halfway Between 70 and 208
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