When you ask "What number is halfway between 21 and 196?" 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=196.
To find the number halfway between 21 and 196, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 196 into our formula, we get:
(21 + 196)/2 = 108.5
Thus, the number halfway between 21 and 196 is 108.5.
To check that our answer is correct, we subtract 21 from 108.5 and subtract 108.5 from 196 and compare the two numbers:
108.5 - 21 = 87.5
196 - 108.5 = 87.5
As you can see, the halfway number is 87.5 higher than 21 and 87.5 lower than 196. Therefore, our halfway between answer of 108.5 above is correct.
Halfway Between
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Halfway Between 21 and 197
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