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Subtracting Multiples of Ten – Learn to subtract multiples of 10 – Numbers like 10, 20, 30 are multiples of 10 – Subtracting 10 is like taking away 1 group of 10 – Imagine 10 apples, remove 1 apple, now you have 9 apples – Practice with examples: 30 – 10, 50 – 20 – If you have 3 groups of 10 apples and take 1 group away, you have 20 apples left | Welcome students to the math class and introduce them to the concept of subtracting multiples of ten. Explain that multiples of ten are numbers that can be counted by tens, such as 10, 20, 30, and so on. Emphasize that when we subtract a multiple of ten, we are essentially taking away groups of ten. Use tangible examples like groups of apples to illustrate the concept. Provide simple subtraction problems such as 30 – 10 and 50 – 20, and solve them together as a class. Encourage students to visualize the process and use their fingers or objects to count if necessary. The goal is for students to become comfortable with the idea of subtracting in tens and to recognize patterns in subtraction.

Understanding Multiples of Ten – What are multiples of ten? – Numbers like 10, 20, 30, up to 100 – Multiples as building blocks – They form the foundation of our number system – Counting by tens together – Let’s count: 10, 20, 30… Can you continue? – Practice with examples – Example: 10 – 10 = 0, 20 – 10 = 10 | This slide introduces the concept of multiples of ten, which are the cornerstone of our base-ten number system. Explain that these numbers are easily recognizable and are used frequently in everyday life. Engage the students by counting by tens as a class to reinforce the pattern and rhythm of these numbers. Use visual aids like number lines or counters if possible to help students visualize the concept. Encourage participation and make it fun by perhaps incorporating a song or a game. Conclude with simple subtraction examples to show how these multiples can be used in arithmetic operations.

Subtracting Multiples of Ten: Starting with Ten – Understanding 10 – 10 – When we subtract 10 from 10, we get 0. – Visualize with 10 apples – Picture yourself holding 10 apples in your hands. – Giving all apples away – If you give all 10 apples to a friend, how many do you have? – What’s left after? – After giving them away, you have no apples left. | This slide introduces the concept of subtraction by using a relatable example of having and giving away apples. It’s important to start with a simple problem like 10 minus 10 to build confidence. Use real apples or a visual aid to help students understand the concept of subtraction as ‘taking away.’ Ask the students to imagine the scenario and count out loud as they ‘give away’ the apples. This will help them grasp that when we subtract the same number from itself, the result is zero. Encourage the students to think of other examples where they have a certain number of items and then have none left after giving them all away.

Subtracting Multiples of Ten – Subtracting 20 by giving away 10 – If you start with 20 apples and give 10 away, how many do you have left? – Subtracting 30 by giving away 10 – What if you have 30 apples to start and you give 10 away? – Let’s solve examples together – Understanding subtraction patterns – Notice how subtracting 10 always reduces the number by one ten. | This slide is aimed at helping first graders understand the concept of subtraction by using multiples of ten. Start with a relatable example such as having a certain number of apples and giving some away. This visual and tangible example helps them grasp the concept of subtraction as ‘taking away.’ Encourage the students to count backwards from 20 and 30 by tens to find the answer. Use the examples to show the pattern that emerges when we subtract multiples of ten. Reinforce the idea that subtracting ten takes away one ‘ten’ from the total. During the class, work through several examples together and ask students to try their own. Provide guidance and positive reinforcement as they work through the problems.

Subtracting Multiples of Ten with a Number Line – Number lines show subtraction – Imagine a line with numbers in order, it helps us see subtraction steps. – Each jump back is minus ten – If we’re at 50, a jump back lands us at 40, then 30, and so on. – Practice with a number line – Let’s jump back in tens! – We’ll try examples together, like 60 – 20! | This slide introduces the concept of using a number line to subtract multiples of ten, which is a visual and interactive method suitable for first graders. Start by explaining what a number line is and how it can be used to represent numbers and their relationships. Demonstrate how to subtract by making jumps backwards on the number line, emphasizing that each jump represents subtracting ten. Use clear examples, such as starting at 50 and jumping back to 40, then 30, to show subtraction in action. Encourage students to draw their own number lines and practice subtracting multiples of ten by jumping backwards. This will help them visualize the subtraction process and understand the concept of ‘taking away’ in larger chunks.

Practice Time: Subtracting Multiples of Ten – Let’s practice with subtraction problems – Subtract multiples of ten from numbers – If we have 60 and subtract 10, we get 50 – Count backwards by tens to subtract – Like 90, 80, 70; it’s like hopping back on the number line – Use your fingers to help count – Hold up 10 fingers, put down 1 finger for every 10 you subtract | This slide is for a hands-on practice activity where students will apply their knowledge of subtraction by working with multiples of ten. Encourage the students to visualize the process by counting backwards in tens, which can be likened to hopping back on a number line. Using physical movement, like putting down fingers for each count of ten, can help kinesthetic learners grasp the concept better. Prepare a set of problems for the students to solve, ensuring they involve subtracting multiples of ten from various numbers. Monitor the class as they work through the problems, offering guidance and support as needed. After the activity, discuss the solutions as a class to reinforce the learning.

Subtraction Game: Rolling & Subtracting – Play a game with classmates – Roll the dice to move – Subtract tens on the board – If you land on 50, and roll a 3, move to 20 (50 – 30) – Find the answer together | This interactive game is designed to help first graders practice subtracting multiples of ten in a fun and engaging way. Set up a game board with numbers in multiples of ten. Students will take turns rolling a dice and moving their game piece forward that many spaces, each labeled with a multiple of ten. When they land on a number, they’ll subtract ten times the number they rolled from their current number to find the answer. For example, if a student is on 50 and rolls a 3, they subtract 30 (since 3 tens is 30) to move to 20. This activity reinforces the concept of subtraction by tens and provides a hands-on learning experience. Prepare different game boards for variety and to ensure each student can participate and practice.

Class Activity: Subtracting with Blocks – Each block equals ten – Remove blocks to subtract tens – If we have 5 blocks and take away 2, we’re subtracting 20 (2 blocks x 10) – Pair up for block subtraction – Solve subtraction problems together | This activity is designed to help first graders visualize the concept of subtracting multiples of ten using a hands-on approach. By assigning the value of ten to each block, students can physically manipulate the blocks to see the subtraction process. Encourage students to work in pairs to foster collaboration and discussion, which can lead to a deeper understanding of the concept. As they work through the problems, guide them to articulate their thought process and the steps they are taking. Possible activities include: 1) Starting with a set number of blocks and taking turns to subtract blocks, 2) Creating a ‘store’ where items ‘cost’ multiples of ten and students ‘buy’ items by removing blocks, 3) Having a ‘race’ to see which pair can correctly solve a series of subtraction problems first, 4) Asking students to create their own subtraction problems for their partner to solve, 5) Using the blocks to demonstrate subtraction in a story problem context.

Review: Subtracting Multiples of Ten – Subtracting groups of ten – Imagine 10, 20, 30 as groups of ten blocks. Taking away one group is subtracting ten. – Using tools to subtract – Number lines show jumps back. Objects can be counted away. Games make it fun! – Reflect on today’s lesson – Share your favorite part | This slide is meant to recap what the students have learned about subtracting multiples of ten. Emphasize that when we subtract multiples of ten, we are essentially removing one or more ‘groups of ten’. Use visual aids like number lines or physical objects to illustrate this concept, as these tools can make abstract concepts more concrete for first graders. Encourage the students to think about the activities they did, such as using number lines, counting objects, or playing subtraction games, and ask them to share what they enjoyed the most about the lesson. This reflection helps reinforce their learning and allows you to gauge their interest in different learning tools.

Homework Time: Practice Subtracting Multiples of Ten – Complete the subtraction worksheet – Practice subtracting multiples of ten – Try problems like 60 – 20 or 90 – 30 – Use objects like toys to help count – Count out 10 blocks, remove sets to subtract – Check your work with a family member – Ask someone at home to ensure it’s correct | This homework slide encourages students to practice their subtraction skills, specifically focusing on multiples of ten. The worksheet provided should have a variety of problems where students subtract one multiple of ten from another. Encourage students to use physical objects like toys or blocks to represent the numbers they are working with, as this can make the concept of ‘taking away’ more concrete. Remind them to check their work with a family member for accuracy. This practice will help reinforce their understanding of basic subtraction and prepare them for more complex math concepts.