Estimating fractions

This task is about estimating a sum of fractions.
 

These questions are about estimating not solving to find the exact answer. For the each of the following three problems:

  1. Estimate what you think the sum of all the fractions is; and
  2. Explain how you worked out the estimate.
a)
89 + 1415 + 216
 

Estimate:

How I estimated:
 
 
 
 

 
b)
 
715 + 1112 + 1918 + 3
 

Estimate:

How I estimated:
 
 
 
 

 
c)
 
234 + 12 + 258 + 311
 

Estimate:

How I estimated: