When you ask "What number is halfway between 77 and 402?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=77 and Y=402.
To find the number halfway between 77 and 402, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 402 into our formula, we get:
(77 + 402)/2 = 239.5
Thus, the number halfway between 77 and 402 is 239.5.
To check that our answer is correct, we subtract 77 from 239.5 and subtract 239.5 from 402 and compare the two numbers:
239.5 - 77 = 162.5
402 - 239.5 = 162.5
As you can see, the halfway number is 162.5 higher than 77 and 162.5 lower than 402. Therefore, our halfway between answer of 239.5 above is correct.
Halfway Between
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Halfway Between 77 and 403
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