When you ask "What number is halfway between 8 and 551?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=551.
To find the number halfway between 8 and 551, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 551 into our formula, we get:
(8 + 551)/2 = 279.5
Thus, the number halfway between 8 and 551 is 279.5.
To check that our answer is correct, we subtract 8 from 279.5 and subtract 279.5 from 551 and compare the two numbers:
279.5 - 8 = 271.5
551 - 279.5 = 271.5
As you can see, the halfway number is 271.5 higher than 8 and 271.5 lower than 551. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 8 and 552
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