What is an estimation strategy
This is for 6th grade math please help

Estimation is a mental process of coming up with an answer that is relatively  close, to allow decisions to be made. The types of estimation are quantity, computation and measurement.

An estimation strategy is simply coming up with a good estimate based on evidence and already known facts. Coming to a conclusion as close to the real answer as you can. It can also be called an educated guess.

Since you can't draw on I uploaded a picture of a quadrilateral with only one set of parallel lines and no right angles. It is called a trapezoid. There are some with right angles, but this trapezoid does not have one. 

Hope this helps!! :)