When you ask "What number is halfway between 70 and 689?" 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=689.
To find the number halfway between 70 and 689, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 689 into our formula, we get:
(70 + 689)/2 = 379.5
Thus, the number halfway between 70 and 689 is 379.5.
To check that our answer is correct, we subtract 70 from 379.5 and subtract 379.5 from 689 and compare the two numbers:
379.5 - 70 = 309.5
689 - 379.5 = 309.5
As you can see, the halfway number is 309.5 higher than 70 and 309.5 lower than 689. Therefore, our halfway between answer of 379.5 above is correct.
Halfway Between
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Halfway Between 70 and 690
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