2 minute read
Lesson at a Glance
Students explore ways to organize by counting a set. With guidance, they organize their set on a number path. Students compare and reason about the totals on the number path and discover the usefulness of linear organization. Finally, they use color to represent and compare sets on number paths.
Key Question
• How can we show objects so they are easy to count and compare?
Achievement Descriptor
Count out 6 cubes.
Color how many cubes.
This lesson is foundational to the work of grade 1 and builds from K.CC.C.6 and K.CC.C.7. Lesson content is intended to serve as a formative assessment and is therefore not included on summative assessments in grade 1.
Agenda Materials
Fluency 10 min
Launch 5 min
Learn 35 min
• Count a Set
• Organize to Count and Compare
• Problem Set
Land 10 min
Teacher
• 20-bead rekenrek
• Unifix® Cubes (16)
• Large number path
• Teacher computer or device*
• Projection device*
• Teach book*
Students
• Bag of Unifix® Cubes
• Large number path
• Pencil*
• Learn book*
• Personal whiteboard*
• Dry-erase marker*
• Whiteboard eraser*
* These materials are only listed in lesson 1. Ready these materials for every lesson.
Lesson Preparation
• Gather 16 Unifix Cubes: 7 of one color and 9 of a different color.
• Assemble one bag of 10–15 Unifix Cubes per student. Vary the number in each collection, but make sure that each bag contains only one color.
• Write a sentence frame for display: is greater than .
Fluency
Counting on the Rekenrek by Ones Within 5
Materials—T: Rekenrek
Students count by ones to prepare for work with the number path.
Show the rekenrek with the side panel attached. Start with all the beads behind the panel.
Say how many beads there are as I slide them over.
Slide the red beads from behind the panel, one at a time, as students count to 5. 1, 2, 3, 4, 5
Slide the red beads back behind the panel, one at a time, as students count down to 0. 5, 4, 3, 2, 1, 0
Watch closely! Say how many beads there are as I slide them over.
Slide the red beads, one at a time, to the left or to the right in the following sequence as students count:
Continue counting on the rekenrek within 5. Change directions occasionally, emphasizing where students hesitate or count inaccurately. Invite play and promote focus by varying the pace or inserting dramatic pauses.
Ready, Set, Compare
Students compare values within 5 to prepare for comparing quantities by using the number path.
Let’s play Ready, Set, Compare. Have students form pairs and stand facing each other.
Model the action: Make a fist, and shake it on each word as you say, “Ready, set, compare.” At “compare,” open your fist, and hold up any number of fingers.
Tell students that they will make the same motion. At “compare,” they will show their partner any number of fingers. Consider doing a practice round with students.
Clarify the following directions:
• To show zero, show a closed fist at “compare.”
• Showing more fingers is not a win.
• Try to use different numbers each time to surprise your partner.
“I’m showing more fingers.” “4 is greater than 2.”
Each time partners show fingers, have them compare amounts. They might say, “I’m showing more fingers,” “I’m showing fewer fingers,” or “We’re showing the same number of fingers.” See the sample dialogue under the photograph.
Invite partners to use the word greater. For example, “ is greater than .”
Circulate as students play the game to ensure they are trying a variety of numbers within 5.
Differentiation: Support
If students need support with comparing, they can use the one-to-one matching strategy of touching fingertips to compare their numbers.
Consider also having students say their counts as they touch fingertips so that they experience the greater number being said last.
