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Welcome to Subtraction! – Greetings, bright minds! – Today’s lesson: taking away numbers – We’ll learn how to subtract numbers, like 3 from other numbers – Subtraction shows us what’s left – If you have 5 apples and eat 3, subtraction tells you 2 are left – Practice with subtracting 3 – Let’s try examples: 10 – 3, 7 – 3, and 4 – 3 | This slide is designed to introduce first graders to the concept of subtraction, specifically subtracting the number 3. Start with a warm greeting to engage the students. Explain that subtraction is like taking away and helps us figure out how many items remain. Use relatable examples, such as apples, to illustrate the concept. Encourage the students to think of subtraction as a useful tool in everyday life. Provide clear examples on the board and guide the students through the process of subtracting 3 from different numbers. Ensure to use visual aids like counters or fingers to help them understand. The goal is to make them comfortable with the idea of ‘taking away’ and to practice this skill with various numbers up to 20.

Understanding Subtraction: Taking Away – Subtraction means taking away – Subtract to find how many left – Imagine 3 apples, give 1 away – If you start with 3 and give 1 to a friend, you use subtraction to find out what’s left. – How many apples are left? – It’s like a mini-story with numbers! | This slide introduces the concept of subtraction to first graders by relating it to a simple and relatable scenario of having apples and giving some away. Start by explaining that subtraction is a way of finding out how many things are left after some are taken away. Use props or visuals if possible to show 3 apples and physically remove 1 to visually demonstrate the concept. Ask the students to guess how many apples are left to engage them. Emphasize that subtraction helps us figure out the answer. This sets the foundation for understanding subtraction as ‘taking away’ and prepares them for practical exercises.

Subtracting 3 from Numbers up to 20 – Practice subtracting 3 from numbers – If we have 15 apples and take away 3, how many do we have? – Use fingers or a number line for help – Counting down from a number, 3 steps back – Subtraction makes numbers smaller – Like when we have 10 candies and eat 3, we have 7 left! – Let’s try some examples together | This slide is aimed at helping first graders understand the concept of subtraction by taking away 3 from various numbers up to 20. Encourage the students to use their fingers or a number line as visual and tactile aids to count backward from a given number. Emphasize that subtraction results in a smaller number, which can be demonstrated through practical examples like subtracting items from a group. Engage the class with interactive examples, asking them to participate by using their fingers or drawing on a number line. Provide a variety of examples to ensure that students can apply the concept of subtracting 3 to different starting numbers.

Subtracting 3: Learning with Blocks – Start with 5 blocks – Take away 3 blocks – Count what’s left – Count backwards like this: 5…4, 3, 2 – Discover the answer – After removing 3, we find 2 blocks remain | This slide is aimed at helping first graders understand the concept of subtraction by using a tangible example. Begin by visualizing 5 blocks, then physically or imaginatively remove 3 blocks to help them see the subtraction process. Encourage the students to count backwards from 5 to 2, which reinforces the concept of taking away. After the subtraction, prompt them to count the remaining blocks to find the answer. This hands-on approach makes the abstract concept of subtraction more concrete and understandable for young learners. During the next class, have the students practice with different numbers, always subtracting 3, to solidify their understanding.

Your Turn to Try: Subtracting 3 – Time to subtract 3 on your own – Let’s solve: 10 – 3 – Use fingers to subtract – Count backwards 3 fingers from 10 – Or use the number line – Point to 10, then hop back 3 spaces | This slide is an interactive activity for students to practice subtracting 3. Encourage them to use their fingers or a number line as visual and tactile aids to understand the concept of subtraction. For 10 – 3, they can hold up 10 fingers and then put 3 fingers down to see 7 fingers remaining, or they can start at 10 on the number line and count back three spaces to land on 7. This exercise helps solidify their understanding of subtraction as ‘taking away’. Prepare to assist students who may struggle and offer praise to those who successfully find the answer.

Practice Time: Subtracting 3 – Let’s practice subtracting 3 – We’ll solve together on the board – Making mistakes is okay – Remember, it’s okay to try again if you get it wrong – Learning and fun go hand in hand – We’ll use fun examples to learn | This slide is designed to create an interactive and supportive environment for first graders to practice subtraction. The focus is on subtracting 3 from various numbers up to 20. Encourage the students to participate actively by coming up to the board to solve problems. Emphasize that making mistakes is a natural part of the learning process and that they should not be discouraged. Provide positive reinforcement and guide them through the correct steps if they stumble. Possible activities include using physical objects like blocks or counters to visualize subtraction, subtraction songs, or group games that involve subtracting 3. The goal is to make learning subtraction an enjoyable and confidence-building experience.

Subtraction Game: Subtracting 3 – Let’s play a subtraction game! – I’ll show a number, you subtract 3 – If I show 10, what’s 10 minus 3? – Shout out the answer loudly – Get ready to have fun and learn! | This interactive game is designed to help first graders practice and reinforce their subtraction skills, specifically subtracting the number 3 from other numbers up to 20. As you show each number, encourage the students to quickly visualize the subtraction and confidently shout out the answer. This will not only help them with mental math but also with their speed and accuracy. Be prepared with a list of numbers up to 20 and ensure to give positive feedback to boost their confidence. You can also use props or flashcards to make the game more engaging. After the game, discuss with the class why it’s important to be able to subtract quickly and how it can be useful in everyday situations.

Class Activity: Subtraction Story – We’ll write a subtraction story – I’ll begin, then subtract 3 – If we start with 10 apples, what’s left after 3 are eaten? – Tell me what happens next – Everyone gets a turn! | This interactive class activity is designed to help students understand subtraction by integrating it into a storytelling format. Begin with a simple story that involves a number of items, then ask the students what happens when 3 items are taken away. For example, ‘We had 10 apples, and we ate 3, how many do we have left?’ As each student contributes, they subtract 3 from the previous number. This activity not only makes learning subtraction fun but also encourages participation and reinforces the concept of subtracting 3. Have additional scenarios ready in case students are shy or need help. Possible scenarios: 15 balloons and 3 fly away, 12 cookies and 3 are given to a friend, etc. Ensure every student understands and gets a chance to engage with the activity.

Review: Subtracting 3 – Subtraction means taking away – Like when we have 5 apples and eat 3, we have 2 left. – Practiced subtracting 3 from numbers up to 20 – If we start with 16 and take away 3, we end up with 13. – Use fingers, number lines, or objects – Counting down from a number by 3s helps us learn subtraction. – Let’s see what we remember! | This slide is a recap of our subtraction lesson, emphasizing the concept of ‘taking away’ to find the remaining quantity. Remind students that subtraction is a basic operation that helps us figure out how many items are left after some are removed. We’ve focused on subtracting the number 3 from various numbers up to 20, using tangible methods like fingers, number lines, or physical objects to visualize the process. Encourage students to share their understanding and demonstrate subtraction with examples. This review solidifies their grasp of the concept and prepares them for more complex subtraction problems.

Homework Time: Practice Subtracting 3 – Complete the subtraction worksheet – Create a subtraction story – Use toys or snacks to make a story – Practice with your family – Subtract 3 items with help from family – Remember, practice makes perfect! | This homework slide encourages students to practice their subtraction skills by completing a provided worksheet and engaging with their family to create a subtraction story. The story activity is designed to help students apply their understanding of subtraction in a real-world context, making the concept more tangible. Encourage students to use objects around the house, like toys or snacks, to subtract three from a group, and to involve their family members in the storytelling process. This will not only reinforce their math skills but also enhance their creativity and narrative abilities. Remind them that consistent practice is key to mastering subtraction.