__Estimating__

Is guessing your answer to solve your problem.

Example:

like 128+1393= My guess (estimation) is 1620.

Doesn't matter if your estimation is wrong, that the point of estimating

__Rounding__

Rounding is rounding your number to the closes tens,hundreds, thousands and etc...

Example like for tens.

34 = 30

645 = 650

1254=1250

Same goes for hundreds.

1308= 1300

1459=1500

And it goes on and on.

__Rounding and Estimating__

Round and Estimating is just the same but they combine. Let's say our question is

25+43=___

Rounding--> (30+40)=60 <-- (Guessing the answers to your problem.)

Now just add the left over.

5+3=8

60+8= 68.

Now you have your answer.

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