When you ask "What number is halfway between 99 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=99 and Y=345.
To find the number halfway between 99 and 345, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 345 into our formula, we get:
(99 + 345)/2 = 222
Thus, the number halfway between 99 and 345 is 222.
To check that our answer is correct, we subtract 99 from 222 and subtract 222 from 345 and compare the two numbers:
222 - 99 = 123
345 - 222 = 123
As you can see, the halfway number is 123 higher than 99 and 123 lower than 345. Therefore, our halfway between answer of 222 above is correct.
Halfway Between
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Halfway Between 99 and 346
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