Kindergarten · Mathematics
Quarter 2 · Week 6 · TEKS
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This kindergarten mathematics lesson focuses on helping students understand addition and subtraction by modeling the actions of joining (for addition) and separating (for subtraction). Students will use objects and drawings to solve word problems involving sums up to 10 and differences within 10, developing foundational skills in number operations aligned with TEKS standards.
Students should be familiar with counting objects up to 10 and recognizing numbers up to 10.
Addition is the action of putting groups of objects together to find out how many there are in all. When we join two groups, we combine them to make a bigger group. For example, if you have 3 blocks and then add 2 more blocks, you join them to find the total number of blocks. This action of joining is the foundation of addition.
Subtraction is the action of taking away or separating some objects from a group to find out how many are left. For example, if you have 5 blocks and take away 2 blocks, you separate them to find how many blocks remain. This action of separating helps us understand subtraction.
Young learners can use physical objects like counters or blocks to model addition and subtraction. For addition, they physically join groups together and count the total. For subtraction, they remove some objects from a group and count what remains. Drawings can also represent these actions by showing groups of items joined or separated. This concrete representation helps students visualize and solve problems.
Students will solve simple word problems that involve adding or subtracting numbers up to 10. For example, a problem might say, "You have 4 apples and get 3 more. How many apples do you have now?" Students can use objects or drawings to model the problem and find the sum or difference. This practice connects math to real-life situations and reinforces understanding.
Some students might confuse addition and subtraction actions or think subtraction always means 'smaller' without understanding the action of separating. Use clear language and physical modeling to show that addition means joining groups and subtraction means separating groups. Encourage students to explain their thinking to clarify understanding.
You have 4 red blocks and 3 blue blocks. If you put them together, how many blocks do you have?
Joining the two groups means adding the number of red blocks and blue blocks. 4 blocks plus 3 blocks equals 7 blocks in total.
7 blocks
There are 6 apples on the table. You eat 2 apples. How many apples are left?
Separating means taking away 2 apples from the 6 apples. 6 apples minus 2 apples equals 4 apples left.
4 apples
Introduce the lesson by showing two small groups of counters (e.g., 2 and 3). Ask students how many counters there are if we put the groups together.
Observe the counters and respond to the question by counting all counters after joining the groups.
This activity helps students see the action of joining as putting groups together to find a total, which is addition.
Provide students with counters and simple word problems involving joining (addition) and separating (subtraction). Guide them to use objects or drawings to solve the problems.
Use counters or draw pictures to model the word problems and find the answers.
Hands-on exploration with objects and drawings allows students to concretely understand addition as joining and subtraction as separating.
Explain the terms addition and subtraction using the actions of joining and separating. Demonstrate with counters and drawings how these actions represent addition and subtraction.
Listen and watch the demonstration. Repeat the terms and explain the actions in their own words.
Clarifying vocabulary and linking it to physical actions helps solidify conceptual understanding of addition and subtraction.
Present real-world word problems involving joining and separating with sums and differences up to 10. Encourage students to solve them using objects or drawings and explain their reasoning.
Solve the problems using counters or drawings and explain how they found the answer.
Applying skills to real-world problems deepens understanding and shows relevance of addition and subtraction.
Ask students to demonstrate joining and separating with counters and solve a short word problem independently. Observe and ask them to explain their thinking.
Use counters to show addition and subtraction and solve a word problem. Explain the steps taken.
This assessment confirms students' ability to model addition and subtraction and solve related problems.
Use counters or draw pictures to model the word problems and find the answers.
Show how to join 2 groups of counters: one group has 1 counter and the other has 2 counters. How many counters are there in all?
There are 3 counters in all because 1 plus 2 equals 3.
If you have 5 blocks and take away 3 blocks, how many blocks do you have left? Use objects or drawings to find the answer.
You have 2 blocks left because 5 minus 3 equals 2.
Solve this word problem: You see 4 birds on a tree. 3 more birds join them. How many birds are there now?
There are 7 birds now because 4 plus 3 equals 7.
Explain how joining groups is different from separating groups using counters or drawings.
Joining groups means putting two or more groups together to find the total (addition), while separating groups means taking some objects away from a group to find how many remain (subtraction).
Create your own word problem that uses joining to add and solve it using drawings or objects.
Example: I have 3 toy cars. My friend gives me 4 more toy cars. How many toy cars do I have now? Answer: 7 toy cars because 3 plus 4 equals 7.
Provide extra counters and one-on-one guidance for students who need help counting and modeling. Use simpler word problems with smaller numbers for students who struggle. Allow students to work in pairs to support each other.
Use clear, simple language and gestures when explaining joining and separating. Show pictures and physical objects to support vocabulary understanding. Repeat key vocabulary and use sentence frames like 'I join ___ and ___ to get ___.'
Challenge students to solve word problems with sums and differences close to 10 independently. Encourage students to explain their reasoning in complete sentences. Have students create their own word problems involving joining and separating.
Encourage families to practice addition and subtraction at home using everyday objects like toys or snacks. Ask students to explain how they join or separate groups to find answers.
Students learned to model addition as joining groups of objects and subtraction as separating groups. They practiced solving word problems using objects and drawings to find sums and differences up to 10. This foundational understanding supports their development of number operations and problem-solving skills aligned with TEKS standards.
Use the exact standards alignment and retrieved-source provenance stored with this enrichment.