Unit 8, Lesson 4
1 More and 1 Less (Optional)
Kindergarten
Preparation
Lesson Narrative
This lesson is optional, because the standards do not require students to compare groups of objects or written numbers beyond 10. This lesson does give students more practice with counting out a given number and determining 1 more and 1 less.
In a previous lesson, students used their knowledge of the count sequence to solve story problems involving adding and subtracting one. In this lesson, students apply this understanding to determine 1 more and 1 less than a given number or group of objects, without a context. Students practice counting out a given number of objects. When determining 1 more or 1 less, students may recount their collection from 1 or may use their knowledge of the count sequence to know what 1 more or 1 less is.
If students need additional support with the concepts in this lesson, refer back to Unit 2, Section D in the curriculum materials.
- Action and Expression
- MLR8
- Explain (orally) strategies for determining “1 more” or “1 less” than a given number.
- Generalize (orally) that adding 1 more results in the next number in the count sequence and taking away 1 results in the previous number in the count sequence.
- Let’s find 1 more or 1 less.
Required Materials
Activity 1
Activity 3
Required Preparation
- Each group of 2 students needs 1 connecting cube and at least 20 two-color counters.
- Each group of 2 students needs the number mat, two-color counters, and connecting cube from the previous activity.
- Each group 2 also needs crayons and a copy of the blackline master.
- Gather materials from:
- Fewer, Same, More
- Math Fingers
- Tower Build
- Math Stories
- Which One?
Suggested Centers
NoneTeacher Reflection Questions
Look for students you have not observed doing items on the Section A checklist. Identify opportunities to observe these students in future lessons.