In previous lessons, students added a one-digit number and a two-digit number with composing a ten. They also added 2 two-digit numbers without composing a new ten. They discussed approaches based on place value and the properties of operations. They wrote equations to show their thinking.

In this lesson, students add 2 two-digit numbers in any way that makes sense to them. Students may apply methods learned in previous lessons, including approaches based on making a new ten or adding tens and tens and ones and ones. Students are not required to write equations, although some may do so.

How effective were your questions in supporting students’ thinking today? What did students say or do that showed they were effective?