When you ask "What number is halfway between 70 and 221?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=70 and Y=221.
To find the number halfway between 70 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 221 into our formula, we get:
(70 + 221)/2 = 145.5
Thus, the number halfway between 70 and 221 is 145.5.
To check that our answer is correct, we subtract 70 from 145.5 and subtract 145.5 from 221 and compare the two numbers:
145.5 - 70 = 75.5
221 - 145.5 = 75.5
As you can see, the halfway number is 75.5 higher than 70 and 75.5 lower than 221. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 70 and 222
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