If I round $$1315$$ to the nearest ten, then multiply the result by $$3$$, then round to the nearest hundred, what is my final result? 
Overseas Competition->Knowledge Point->Calculation Modules->Comparing, Ordering and Estimating->Estimating Large Numbers
If I round $$1315$$ to the nearest ten, I get $$1320$$. Then, I multiply by $$3$$ to get $$3960$$. To the nearest hundred, this is $$4000$$. 