When you ask "What number is halfway between 84 and 402?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=402.
To find the number halfway between 84 and 402, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 402 into our formula, we get:
(84 + 402)/2 = 243
Thus, the number halfway between 84 and 402 is 243.
To check that our answer is correct, we subtract 84 from 243 and subtract 243 from 402 and compare the two numbers:
243 - 84 = 159
402 - 243 = 159
As you can see, the halfway number is 159 higher than 84 and 159 lower than 402. Therefore, our halfway between answer of 243 above is correct.
Halfway Between
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Halfway Between 84 and 403
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