When you ask "What number is halfway between 73 and 198?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=73 and Y=198.
To find the number halfway between 73 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 198 into our formula, we get:
(73 + 198)/2 = 135.5
Thus, the number halfway between 73 and 198 is 135.5.
To check that our answer is correct, we subtract 73 from 135.5 and subtract 135.5 from 198 and compare the two numbers:
135.5 - 73 = 62.5
198 - 135.5 = 62.5
As you can see, the halfway number is 62.5 higher than 73 and 62.5 lower than 198. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 73 and 199
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