When you ask "What number is halfway between 99 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=99 and Y=551.
To find the number halfway between 99 and 551, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 551 into our formula, we get:
(99 + 551)/2 = 325
Thus, the number halfway between 99 and 551 is 325.
To check that our answer is correct, we subtract 99 from 325 and subtract 325 from 551 and compare the two numbers:
325 - 99 = 226
551 - 325 = 226
As you can see, the halfway number is 226 higher than 99 and 226 lower than 551. Therefore, our halfway between answer of 325 above is correct.
Halfway Between
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Halfway Between 99 and 552
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