When you ask "What number is halfway between 75 and 990?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=75 and Y=990.
To find the number halfway between 75 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 990 into our formula, we get:
(75 + 990)/2 = 532.5
Thus, the number halfway between 75 and 990 is 532.5.
To check that our answer is correct, we subtract 75 from 532.5 and subtract 532.5 from 990 and compare the two numbers:
532.5 - 75 = 457.5
990 - 532.5 = 457.5
As you can see, the halfway number is 457.5 higher than 75 and 457.5 lower than 990. Therefore, our halfway between answer of 532.5 above is correct.
Halfway Between
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Halfway Between 75 and 991
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