Discuss with students what
"about" means. Some possible
answers are 60 and 9, 60 and
12, 59 and 12, 43 and 28, 54
and 12.
35 and 54, 59 and 28,
60 and 28
60 and 59, 60 and 54, 60 and
43, 59 and 54, 59 and 43
Students' strategies will vary.
Possible strategy: If both
numbers are larger than 50,
then I knew the answer would
be more than 100. Then I
looked to see if the numbers
were close to 50 and
estimated.