When you ask "What number is halfway between 51 and 155?" 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=155.
To find the number halfway between 51 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 155 into our formula, we get:
(51 + 155)/2 = 103
Thus, the number halfway between 51 and 155 is 103.
To check that our answer is correct, we subtract 51 from 103 and subtract 103 from 155 and compare the two numbers:
103 - 51 = 52
155 - 103 = 52
As you can see, the halfway number is 52 higher than 51 and 52 lower than 155. Therefore, our halfway between answer of 103 above is correct.
Halfway Between
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Halfway Between 51 and 156
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