When you ask "What number is halfway between 51 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=51 and Y=154.
To find the number halfway between 51 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 154 into our formula, we get:
(51 + 154)/2 = 102.5
Thus, the number halfway between 51 and 154 is 102.5.
To check that our answer is correct, we subtract 51 from 102.5 and subtract 102.5 from 154 and compare the two numbers:
102.5 - 51 = 51.5
154 - 102.5 = 51.5
As you can see, the halfway number is 51.5 higher than 51 and 51.5 lower than 154. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 51 and 155
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