When you ask "What number is halfway between 40 and 158?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=40 and Y=158.
To find the number halfway between 40 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 158 into our formula, we get:
(40 + 158)/2 = 99
Thus, the number halfway between 40 and 158 is 99.
To check that our answer is correct, we subtract 40 from 99 and subtract 99 from 158 and compare the two numbers:
99 - 40 = 59
158 - 99 = 59
As you can see, the halfway number is 59 higher than 40 and 59 lower than 158. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 40 and 159
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