When you ask "What number is halfway between 20 and 157?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=157.
To find the number halfway between 20 and 157, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 157 into our formula, we get:
(20 + 157)/2 = 88.5
Thus, the number halfway between 20 and 157 is 88.5.
To check that our answer is correct, we subtract 20 from 88.5 and subtract 88.5 from 157 and compare the two numbers:
88.5 - 20 = 68.5
157 - 88.5 = 68.5
As you can see, the halfway number is 68.5 higher than 20 and 68.5 lower than 157. Therefore, our halfway between answer of 88.5 above is correct.
Halfway Between
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Halfway Between 20 and 158
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