17/33x11/20=___
So just do the problem in order. Then you get an answer of 0.2833.
Then to check your answer do the estimate thing. So 17 rounds to 20 and 33 rounds to 30 and 11 rounds to 10 and I like 20 so I'll stick with that.
20/30x10/20=___
And when you put the answer in a calculator you get .33333whatever so that equals 1/3. So You know that 1/3 is the right answer cause it is close to the exact one.
