Estimating with addition
This task is about estimating the sum of whole numbers.
An estimate is sometimes called a "good guess" that is easy to do in your head. The following questions are about estimating, NOT about working out the exact answer. 
a)

i) Estimate the sum of: 86 + 47 + 65 __________
ii) Show or explain how you estimated the sum in the box below.


b)

i) Estimate the sum of: 254 + 463 + 129 __________ ii) Show or explain how you estimated the sum in the box below.


c)

i) Estimate the sum of: 386 + 76 + 9 + 457 __________
ii) Show or explain how you estimated the sum in the box below.
