When you ask "What number is halfway between 70 and 669?" 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=669.
To find the number halfway between 70 and 669, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 669 into our formula, we get:
(70 + 669)/2 = 369.5
Thus, the number halfway between 70 and 669 is 369.5.
To check that our answer is correct, we subtract 70 from 369.5 and subtract 369.5 from 669 and compare the two numbers:
369.5 - 70 = 299.5
669 - 369.5 = 299.5
As you can see, the halfway number is 299.5 higher than 70 and 299.5 lower than 669. Therefore, our halfway between answer of 369.5 above is correct.
Halfway Between
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Halfway Between 70 and 670
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