When you ask "What number is halfway between 7 and 422?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=422.
To find the number halfway between 7 and 422, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 422 into our formula, we get:
(7 + 422)/2 = 214.5
Thus, the number halfway between 7 and 422 is 214.5.
To check that our answer is correct, we subtract 7 from 214.5 and subtract 214.5 from 422 and compare the two numbers:
214.5 - 7 = 207.5
422 - 214.5 = 207.5
As you can see, the halfway number is 207.5 higher than 7 and 207.5 lower than 422. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 7 and 423
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