When you ask "What number is halfway between 7 and 421?" 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=421.
To find the number halfway between 7 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 421 into our formula, we get:
(7 + 421)/2 = 214
Thus, the number halfway between 7 and 421 is 214.
To check that our answer is correct, we subtract 7 from 214 and subtract 214 from 421 and compare the two numbers:
214 - 7 = 207
421 - 214 = 207
As you can see, the halfway number is 207 higher than 7 and 207 lower than 421. Therefore, our halfway between answer of 214 above is correct.
Halfway Between
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Halfway Between 7 and 422
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