When you ask "What number is halfway between 87 and 154?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=154.
To find the number halfway between 87 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 154 into our formula, we get:
(87 + 154)/2 = 120.5
Thus, the number halfway between 87 and 154 is 120.5.
To check that our answer is correct, we subtract 87 from 120.5 and subtract 120.5 from 154 and compare the two numbers:
120.5 - 87 = 33.5
154 - 120.5 = 33.5
As you can see, the halfway number is 33.5 higher than 87 and 33.5 lower than 154. Therefore, our halfway between answer of 120.5 above is correct.
Halfway Between
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Halfway Between 87 and 155
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