When you ask "What number is halfway between 100 and 977?" 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=977.
To find the number halfway between 100 and 977, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 977 into our formula, we get:
(100 + 977)/2 = 538.5
Thus, the number halfway between 100 and 977 is 538.5.
To check that our answer is correct, we subtract 100 from 538.5 and subtract 538.5 from 977 and compare the two numbers:
538.5 - 100 = 438.5
977 - 538.5 = 438.5
As you can see, the halfway number is 438.5 higher than 100 and 438.5 lower than 977. Therefore, our halfway between answer of 538.5 above is correct.
Halfway Between
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Halfway Between 100 and 978
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