Question

what is the estimated difference between 3465 and 2716

Answer 1

You would round up 3465 to 3470 and round up 2716 to 2720, the difference would be 750

Answer 2

3465 - 2716 = 749. If you are trying to round this to the nearest tens, then your answer is 450. If you are trying to round this to the nearest hundred, then your answer is 700. If you are not trying to round to either of those, then your answer is 749. :)