When you ask "What number is halfway between 100 and 351?" 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=351.
To find the number halfway between 100 and 351, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 351 into our formula, we get:
(100 + 351)/2 = 225.5
Thus, the number halfway between 100 and 351 is 225.5.
To check that our answer is correct, we subtract 100 from 225.5 and subtract 225.5 from 351 and compare the two numbers:
225.5 - 100 = 125.5
351 - 225.5 = 125.5
As you can see, the halfway number is 125.5 higher than 100 and 125.5 lower than 351. Therefore, our halfway between answer of 225.5 above is correct.
Halfway Between
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Halfway Between 100 and 352
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