Estimating addition IV
This task is about estimating the addition of numbers.
An estimate is sometimes called a "good guess" that is easy to do in your head. The following questions are about estimating NOT working out the exact answer.
a) 
i) Estimate the sum of 18 + 23
ii) Show how you estimated the sum. 
I estimated the sum was about __________


b)

i) Estimate the sum of 16 + 27 + 41
ii) Show how you estimated the sum. 
I estimated the sum was about __________


c)

i) Estimate the sum of 127 + 179
ii) Show how you estimated the sum. 
I estimated the sum was about __________
