When you ask "What number is halfway between 86 and 170?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=86 and Y=170.
To find the number halfway between 86 and 170, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 170 into our formula, we get:
(86 + 170)/2 = 128
Thus, the number halfway between 86 and 170 is 128.
To check that our answer is correct, we subtract 86 from 128 and subtract 128 from 170 and compare the two numbers:
128 - 86 = 42
170 - 128 = 42
As you can see, the halfway number is 42 higher than 86 and 42 lower than 170. Therefore, our halfway between answer of 128 above is correct.
Halfway Between
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Halfway Between 86 and 171
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