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Adding & Subtracting Three-Digit Numbers – Combining three-digit numbers – Like putting together puzzle pieces: 123 + 456 – Taking apart three-digit numbers – Like breaking a cookie into pieces: 789 – 321 – Real-life applications – Use it for money, time, and measurements – Practice makes perfect | Today’s lesson is focused on teaching students how to add and subtract three-digit numbers. Start by explaining the concept of combining numbers as if they are puzzle pieces that fit together to make a bigger picture. Then, illustrate taking numbers apart by comparing it to breaking a cookie into smaller pieces. Emphasize the importance of these skills in everyday life, such as managing money, understanding time, and measuring objects. Encourage students to practice these operations to become more confident in their math skills. Provide various examples and ensure to include word problems that relate to real-life scenarios to highlight the practicality of learning these operations.

Understanding Three-Digit Numbers – Review: Place Values – Hundreds, Tens, Ones in numbers like 345 – Examples of Three-Digit Numbers – 123 (One hundred twenty-three), 456 (Four hundred fifty-six), 789 (Seven hundred eighty-nine) – Adding Three-Digit Numbers – Stack numbers vertically & add each place value – Subtracting Three-Digit Numbers – Stack numbers vertically & subtract each place value | Begin with a quick review of place values to ensure students are comfortable with the concept of hundreds, tens, and ones. Use visual aids like blocks or charts if necessary. Provide clear examples of three-digit numbers, emphasizing the value of each digit according to its position. Move on to demonstrate how to add and subtract three-digit numbers, using the vertical stacking method to align place values correctly. Encourage students to practice with sample problems and to check their work by reversing the operation (e.g., checking subtraction with addition).

Adding Three-Digit Numbers – Line up numbers by place value – Ensure digits are in correct columns: Ones, Tens, Hundreds – Start with Ones, then Tens, Hundreds – Add 3 + 7, then 50 + 20, then 400 + 300 – Carry over for sums over 9 – If sum is 10 or more, carry over to the next column – Practice with examples | This slide introduces students to the concept of adding three-digit numbers. Emphasize the importance of aligning numbers by their place values to avoid confusion. Begin with the Ones place and move left to Tens and Hundreds, explaining that each column represents a different value. Demonstrate carrying over when a sum exceeds 9, which is a crucial step in addition. Include examples like 123 + 456 to practice in class. Encourage students to work through problems step-by-step and to check their work by adding in reverse order. Provide additional practice problems for homework to reinforce the concept.

Let’s Practice Adding Three-Digit Numbers! – Example problem: 234 + 456 – Add 234 and 456 step by step – Solve together on the board – Discuss with a partner – Explain how you got your answer – Share your strategies – Talk about carrying over numbers | This slide is designed to engage students in a collaborative learning process. Start with the example problem 234 + 456 and solve it as a class on the board, ensuring to break down the steps: add the ones, then the tens, then the hundreds, carrying over as necessary. After solving it together, have the students turn to a partner and discuss their answers and the methods they used to arrive at them. Encourage them to share different strategies they might have used, such as starting from the hundreds or using manipulatives. This peer interaction helps solidify their understanding and allows them to see multiple approaches to solving the same problem. As a teacher, walk around to listen to discussions and provide guidance where needed. Prepare to discuss common challenges or misconceptions in the next class.

Subtracting Three-Digit Numbers – Line up numbers by place value – Make sure the Hundreds, Tens, and Ones are in the right columns – Subtract Ones, then Tens, then Hundreds – Always start subtracting from the rightmost column – Borrow from the next place value if needed – If the top number is smaller, borrow 1 from the next column to the left – Check your work for accuracy | This slide is focused on teaching students the correct method to subtract three-digit numbers. Emphasize the importance of lining up numbers by their place values to avoid confusion. Demonstrate the process of subtraction by starting from the Ones place and moving left towards the Tens and Hundreds. Explain the concept of borrowing, which may also be referred to as ‘regrouping’, when the digit in the upper number is smaller than the one below it. After completing the subtraction, encourage students to double-check their answers. Provide several examples on the board and work through them as a class. For homework, assign problems that require borrowing across zeros, as this can be a challenging concept for third graders.

Let’s Practice Subtracting! – Subtracting three-digit numbers – Example: 645 – 123 – Take 123 away from 645 step by step – Solve together on the board – We’ll break it down together, step by step – Discuss your answer with a partner – Explain how you got your answer | This slide is designed to engage students in the process of subtracting three-digit numbers. Start by presenting the example problem 645 – 123 on the board. Walk through the problem step by step with the class, ensuring to explain carrying over numbers where necessary. After solving the problem as a class, have the students turn to their neighbor and discuss their answers and the steps they took to get there. This peer discussion helps solidify their understanding and allows them to learn from each other. As a teacher, circulate the room to listen to discussions and provide guidance where needed. Prepare to offer additional examples if time allows and encourage students to come up with their own subtraction problems to challenge their peers.

Word Problems: Applying Addition and Subtraction – Solve real-world problems – Use subtraction with hundreds – Subtracting large numbers like 300 – 150 – Example: Apples problem – If starting with 300 apples and give away 150, how many are left? – Practice with similar problems – Try problems with other items and numbers | This slide aims to help students apply their knowledge of adding and subtracting three-digit numbers to solve real-world problems. Start with an example that is easy to visualize, like the apples problem provided. Explain how to set up the subtraction problem and solve it step by step. After going through the example, encourage students to come up with similar problems, perhaps using items of interest to them. This will help them understand the practical application of the math skills they’ve learned. Provide guidance on how to approach word problems and the importance of understanding the question before attempting to solve it.

Class Activity: Math Relay! – Split into teams for a math challenge – Each member solves a part of the problem – Work together to finish first – Correct answers win the relay! | This activity is designed to encourage teamwork and reinforce the concept of adding and subtracting three-digit numbers. Divide the class into small groups, ensuring that each team has an equal number of students. Provide each team with a multi-step problem that requires both addition and subtraction of three-digit numbers. Each student in the team is responsible for solving one part of the problem. Once a team believes they have the correct final answer, they can raise their hand to have it checked. The first team with the correct answer wins the relay. Prepare several sets of problems so that teams can try more than one relay if time permits. This activity promotes cooperative learning and helps students practice their computational skills in a fun and competitive environment.

Conclusion & Homework: Mastering Math! – Celebrate your math skills – Homework: Worksheet completion – Add and subtract numbers like 345 + 678 or 456 – 123 – Focus on three-digit numbers – Keep practicing at home – The more you practice, the better you’ll get! | Well done on today’s math lesson on adding and subtracting three-digit numbers! As homework, students are expected to complete the provided worksheet which will reinforce their understanding of the concepts learned in class. Encourage them to practice regularly as this will help solidify their skills. Remind them to check their work for accuracy and to use the strategies taught in class. For the next class, be prepared to review the homework, answer questions, and provide additional practice if necessary. Celebrate their progress and remind them that every math wizard started with learning the basics!