When you ask "What number is halfway between 70 and 217?" 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=217.
To find the number halfway between 70 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 217 into our formula, we get:
(70 + 217)/2 = 143.5
Thus, the number halfway between 70 and 217 is 143.5.
To check that our answer is correct, we subtract 70 from 143.5 and subtract 143.5 from 217 and compare the two numbers:
143.5 - 70 = 73.5
217 - 143.5 = 73.5
As you can see, the halfway number is 73.5 higher than 70 and 73.5 lower than 217. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 70 and 218
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