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Making Numbers with Addition and Subtraction – Learn to make numbers up to 20 – Understand addition – Adding numbers is like putting together – Grasp subtraction – Taking away from a number – Mix addition and subtraction – Use both to reach the same number, e.g., 10 – 5 + 5 = 10 | This slide introduces the concept of creating numbers using addition and subtraction, which is a fundamental skill in second-grade mathematics. Start by explaining that numbers can be made in different ways using these operations. Show how addition combines numbers to make a larger one, while subtraction takes away from a number to make it smaller. Then, demonstrate how both operations can be used together to make the same number, using simple examples that add up to 20 or less. Encourage students to think of their own examples and understand that there are multiple ways to reach the same result. This will set the foundation for understanding mixed operations and how they apply to everyday math problems.

Exploring Addition: Ways to Make a Number – Understanding addition – Addition is combining two numbers to make a new total. – Adding with examples – For instance, 5 apples + 3 apples equals how many apples? – Counting to find the sum – We can count all the apples together: 1, 2, 3, 4, 5, 6, 7, 8. – Practice with real objects | This slide introduces the concept of addition as a way to combine numbers to find a total. Use relatable examples like combining apples to make the concept tangible for second graders. Demonstrate how to count on from the larger number to find the answer more efficiently. Encourage students to use physical objects like counters or drawings to practice addition. This hands-on approach helps solidify their understanding of addition as putting together and prepares them for learning subtraction as taking away.

Understanding Subtraction – Subtraction means taking away – Example with balloons – If you have 8 balloons and 3 fly away, how many are left? – Count to find the answer – We’ll use our fingers or draw to count the remaining balloons – Subtraction within 20 – Practice with numbers 1 to 20 to get better at subtraction | This slide introduces the concept of subtraction to second-grade students by relating it to a tangible example of balloons. Subtraction is explained as the process of taking away from a total amount. Use the example of balloons to make it visual and engaging: if a student starts with 8 balloons and loses 3, they can count the remaining balloons to find the answer. Encourage students to use their fingers or drawings to visualize the subtraction process. Emphasize that we are working with numbers up to 20, which is appropriate for their grade level. In the next class, students can practice subtraction with different numbers within this range to reinforce the concept.

Making 10 with Addition – Understanding making 10 – We can add two numbers to get 10 – Example: 7 + 3 equals 10 – Adding 7 and 3 makes 10 – Discover other combinations – What other numbers add up to 10? – Practice with different numbers – Try using numbers like 1, 2, and 9 | This slide introduces the concept of making 10 using addition, which is a fundamental skill in understanding place value and arithmetic operations. Start by explaining that there are multiple combinations of numbers that can be added together to total 10. Use the example provided (7 + 3 = 10) to illustrate this point. Then, encourage students to think of other pairs of numbers that add up to 10, such as 6 + 4, 5 + 5, or 8 + 2. Have them practice with different numbers to reinforce the concept. This activity will help students become more comfortable with basic addition and develop mental math strategies.

Making 10 with Subtraction – Start with a number more than 10 – Subtract a number to make 10 – Example: 15 – 5 equals 10 – If we have 15 apples and give away 5, we have 10 left. – Find other numbers that work – Try with 12 – 2 or 14 – 4 and see what you get! | This slide is aimed at helping second-grade students understand the concept of making 10 through subtraction. Start by explaining that we begin with a number greater than 10. Then, we find a number that, when taken away, leaves us with 10. Use the example provided (15 – 5 = 10) to illustrate this concept. Encourage students to think of other pairs of numbers that work similarly. For instance, if we have 12 candies and eat 2, we’re left with 10. Or if there are 14 markers and we put 4 away, 10 remain. During the class, have students come up with their own examples and share them. This activity will reinforce their understanding of subtraction and the concept of ‘making 10’, which is a foundational math skill.

Mixing Addition and Subtraction – Combine addition and subtraction – Reach the same number different ways – Example: 4 + 4 equals 8 – Adding the same number gets 8 – Example: 10 – 2 equals 8 – Subtracting 2 from 10 also gets 8 | This slide introduces the concept that a number can be made using different operations – addition and subtraction. Start by explaining that addition combines numbers to make a larger number, while subtraction takes away from a number to make it smaller. Use simple examples to show that both operations can result in the same number. For instance, adding 4 and 4 makes 8, just as subtracting 2 from 10 also makes 8. Encourage students to think of other examples and to understand that numbers can be connected in various ways through these operations. This will help them to grasp the flexibility of numbers and operations in math.

Let’s Practice Together: Making Numbers! – I’ll give you a number to make – Use addition or subtraction – Example: To make 12, we could do 7 + 5 or 15 – 3 – Work with a partner – Find different combinations – How many ways can you make the number? | This slide is designed to engage students in a collaborative and interactive activity where they practice creating a given number using addition and subtraction. Start by providing a number to the class, such as 12, and ask the students to work with a partner to find as many different ways as possible to make that number using addition or subtraction with numbers up to 20. Encourage them to think creatively and explore various combinations. As they work, circulate around the room to offer guidance and support. After the activity, bring the class together and discuss the different combinations they found. This will help reinforce their understanding of mixed operations and the concept that numbers can be composed and decomposed in multiple ways.

Class Activity: Number Creators – Pair up and pick a number (1-20) – Find 3 addition combinations – Example: For 12, you could have 7+5, 8+4, 6+6 – Find 3 subtraction combinations – Example: For 12, you could have 15-3, 20-8, 14-2 – Get ready to present your findings | This activity is designed to help students understand that numbers can be composed and decomposed in various ways using addition and subtraction. By working in pairs, students can collaborate and discuss different strategies for creating their chosen number. Encourage them to think creatively and to find unique combinations. As they prepare to share their findings, they will practice their communication skills and reinforce their understanding of the concepts. For the teacher: Have materials ready for students to write down their combinations. Monitor the pairs to ensure they are on task and provide guidance as needed. Possible variations of the activity could include using manipulatives, drawing visual representations, or creating a small competition to see which pair can find the most combinations.

Fantastic Number Creators! – Celebrating our math skills – Making numbers with addition & subtraction – We used + and – to make numbers up to 20 – Many combinations to one number – Just like paths in a park, different ways can lead to the same place! – Keep practicing at home! – Try with different numbers and see what you find | Today’s lesson was all about understanding that numbers can be composed and decomposed using addition and subtraction. Reinforce the concept that there isn’t just one ‘right’ way to get to a number, but many different combinations that can be used. Encourage the students to continue practicing at home by creating their own number combinations and sharing them in the next class. This will help solidify their understanding and give them confidence in their ability to work with numbers.