When you ask "What number is halfway between 100 and 345?" 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=345.
To find the number halfway between 100 and 345, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 345 into our formula, we get:
(100 + 345)/2 = 222.5
Thus, the number halfway between 100 and 345 is 222.5.
To check that our answer is correct, we subtract 100 from 222.5 and subtract 222.5 from 345 and compare the two numbers:
222.5 - 100 = 122.5
345 - 222.5 = 122.5
As you can see, the halfway number is 122.5 higher than 100 and 122.5 lower than 345. Therefore, our halfway between answer of 222.5 above is correct.
Halfway Between
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Halfway Between 100 and 346
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