Answer:
I don't know that options but......
if we are rounding to the thousands, then the answer would be 3,000
if hundreds, the answer is 3,400
if tens: 3,390
If ones: 3,390
Step-by-step explanation:
round each number up or down based upon what the digit is.
We can create a formula first.
X will be the unknown number
840= 357+x
-357 -357
483 = x
Hope this helps