When you ask "What number is halfway between 100 and 357?" 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=357.
To find the number halfway between 100 and 357, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 357 into our formula, we get:
(100 + 357)/2 = 228.5
Thus, the number halfway between 100 and 357 is 228.5.
To check that our answer is correct, we subtract 100 from 228.5 and subtract 228.5 from 357 and compare the two numbers:
228.5 - 100 = 128.5
357 - 228.5 = 128.5
As you can see, the halfway number is 128.5 higher than 100 and 128.5 lower than 357. Therefore, our halfway between answer of 228.5 above is correct.
Halfway Between
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Halfway Between 100 and 358
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