Estimating fractions help
Usually i tell my students to use benchmark fractions (1/2, 1/3, 1/4, 1/10) to do estimation problems but i am a little confused at how they arrived at the estimation for the problem given. Please help!!
Problem: 1  4/9  1/5  1/4 Estimation: 1  2/5  1/5  1/5 Another one Problem: 5 and 23/32  3 and 7/16 Estimation: 5 and 3/4  3 and 1/2 
Possibility
Well, I'm only a 3rd grade teacher, but it looks to me like they found similar denominators.
For example, 4/9  1/5  1/4 4/9 is close to 4/10 (2/5) 1/5 (1/5) 1/4 is close to 1/5 So that would explain their estimate. Same for 2nd. 5 and 24/32 would be 5 and 3/4 3 and 8/16 would be 3 and 1/2 Not sure if that helps, but it makes sense to me. 
Thanks
Thanks for your help.

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