In the previous unit, students learned that a ten is a unit made up of 10 ones. Students learned that teen numbers are made up of 1 ten and some more ones. They represented teen numbers using 10-frames, drawings, and expressions (). In kindergarten, students learned the counting sequence by ones and tens up to 100.

The purpose of this lesson is for teachers to formatively assess how students count objects up to 60. In the first activity, students count objects and represent how many in a way that makes sense to them. Then they compare the ways they counted. In the second activity, students count bags of different quantities that are multiples of 10, and begin to make sense of grouping objects into tens. Use objects such as pennies, paper clips, buttons, connecting cubes, inch tiles, or counters. Students should have access to cups, paper plates, and double 10-frames to help them organize their collections.

The recording sheet is provided as a blackline master. Students will use the recording sheet throughout the unit. Consider making 10–12 copies per student.

Identify who has been sharing their ideas in class lately. Make a note of students whose ideas have not been shared and look for an opportunity for them to share their thinking in tomorrow’s lesson.