When you ask "What number is halfway between 12 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=12 and Y=551.
To find the number halfway between 12 and 551, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 551 into our formula, we get:
(12 + 551)/2 = 281.5
Thus, the number halfway between 12 and 551 is 281.5.
To check that our answer is correct, we subtract 12 from 281.5 and subtract 281.5 from 551 and compare the two numbers:
281.5 - 12 = 269.5
551 - 281.5 = 269.5
As you can see, the halfway number is 269.5 higher than 12 and 269.5 lower than 551. Therefore, our halfway between answer of 281.5 above is correct.
Halfway Between
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Halfway Between 12 and 552
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