From Unit 2, Lesson 9.)
EXPLORATION
Students in a math class were working on new problems over two days. The prob.
on day 1 were different from the problems on day 2.
Day 1 Problems
37+528
79-2455
46-1531
Day 2 Problems
25-196
83 + 710
54-36'8
a. What is the rule for the problems on day 1?
b. What is the rule for the problems on day 2?
C. Show another example for day 1.
D. Show another example for day 2
