Students explain subtraction estimation methods used to solve a word problem.
Answers/responses:
Y9 (04/1999)
a)
b)
Hohepa
Indicates estimation using
5 600 – 2 000 = 3 600
which means 5 600 – 1 995 is more than 3 600
because 2 000 is more than 1 995.
or
Other similar explanations.
[Do not accept arguments based on exact calculations.]