When you ask "What number is halfway between 100 and 545?" 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=545.
To find the number halfway between 100 and 545, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 545 into our formula, we get:
(100 + 545)/2 = 322.5
Thus, the number halfway between 100 and 545 is 322.5.
To check that our answer is correct, we subtract 100 from 322.5 and subtract 322.5 from 545 and compare the two numbers:
322.5 - 100 = 222.5
545 - 322.5 = 222.5
As you can see, the halfway number is 222.5 higher than 100 and 222.5 lower than 545. Therefore, our halfway between answer of 322.5 above is correct.
Halfway Between
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Halfway Between 100 and 546
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