Halfway Between 21 and 154

When you ask "What number is halfway between 21 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=21 and Y=154.

Halfway Between Line

To find the number halfway between 21 and 154, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 154 into our formula, we get:

(21 + 154)/2 = 87.5

Thus, the number halfway between 21 and 154 is 87.5.

To check that our answer is correct, we subtract 21 from 87.5 and subtract 87.5 from 154 and compare the two numbers:

87.5 - 21 = 66.5
154 - 87.5 = 66.5

As you can see, the halfway number is 66.5 higher than 21 and 66.5 lower than 154. Therefore, our halfway between answer of 87.5 above is correct.

Halfway Between
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Halfway Between 21 and 155
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