When you ask "What number is halfway between 70 and 489?" 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=489.
To find the number halfway between 70 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 489 into our formula, we get:
(70 + 489)/2 = 279.5
Thus, the number halfway between 70 and 489 is 279.5.
To check that our answer is correct, we subtract 70 from 279.5 and subtract 279.5 from 489 and compare the two numbers:
279.5 - 70 = 209.5
489 - 279.5 = 209.5
As you can see, the halfway number is 209.5 higher than 70 and 209.5 lower than 489. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 70 and 490
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