When you ask "What number is halfway between 100 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=100 and Y=551.
To find the number halfway between 100 and 551, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 551 into our formula, we get:
(100 + 551)/2 = 325.5
Thus, the number halfway between 100 and 551 is 325.5.
To check that our answer is correct, we subtract 100 from 325.5 and subtract 325.5 from 551 and compare the two numbers:
325.5 - 100 = 225.5
551 - 325.5 = 225.5
As you can see, the halfway number is 225.5 higher than 100 and 225.5 lower than 551. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 100 and 552
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