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Welcome to Subtraction! – Greetings and introduction to subtraction – Subtraction means taking away – If you have 5 apples and eat 2, subtraction helps you find how many are left. – Subtraction shows us what’s left – For example, 10 – 3 shows us 7 are left. – Practice with subtraction models | Begin the class with a warm welcome and an introduction to the concept of subtraction as a means of taking away. Explain that subtraction is a fundamental math skill that helps us figure out the number of items remaining after some have been taken away. Use tangible examples, such as apples or toys, to illustrate the concept. Encourage the children to visualize the process by using their fingers or objects to represent the numbers in subtraction sentences. Prepare to demonstrate with models, such as counters or drawings, to show subtraction up to 10 and help them understand what the model shows.

Understanding Subtraction: Taking Away – Subtraction means taking away – Finding the difference between numbers – It’s the result after some are taken from a total amount – Imagine cookies being eaten – If you have 10 cookies and eat 2, subtraction helps us figure out the remaining – How many cookies are left? – Subtract the eaten cookies from the total to find out | This slide introduces the basic concept of subtraction to first graders by relating it to a tangible example: cookies. Subtraction is explained as the process of taking away items from a group and finding out how many are left. It’s important to use relatable examples for young students to grasp abstract mathematical concepts. Encourage them to visualize having a certain number of cookies and then eating some, prompting them to think about how many cookies remain. This real-world application helps solidify the concept of subtraction by showing the ‘difference’ as the number of cookies left after some are eaten. In the next class, we can use physical objects like counters or draw pictures to practice this concept further.

Understanding Subtraction Sentences – Subtraction sentence structure – A subtraction sentence includes numbers and a minus sign (-). – Example: 5 – 2 = 3 – It shows taking 2 from 5 leaves us with 3. – Subtract means ‘take away’ – When we subtract, we’re finding out how many are left. – Visualize with objects – Imagine having 5 apples, remove 2, and count the rest. | This slide introduces the concept of subtraction sentences to first graders. Start by explaining that subtraction is like taking some away from a group of things. Use the example provided to show how the numbers and minus sign in a subtraction sentence tell us how many things to take away and how many are left. Encourage students to visualize the process using real objects, like toys or blocks, to reinforce the concept. During the class, you can have students practice by creating their own subtraction sentences with different numbers and then acting them out with objects.

Let’s Practice Subtraction Together! – Observe objects and remove some – Count the remaining objects – Understand subtraction as taking away – If we have 5 apples and take away 2, we subtract: 5 – 2 – Reinforce with practice – Practice makes perfect! Try with different numbers of objects | This slide is an interactive activity designed to help first graders understand the concept of subtraction by visualizing and physically removing objects. Start by showing a group of objects, then remove a few and count the remaining ones together. Emphasize that subtraction is simply the process of taking away. Use concrete examples, such as apples or blocks, to make it relatable. Encourage the students to participate actively by asking them how many objects are left after some are taken away. Provide several rounds of practice with different quantities to reinforce the concept. The goal is to build a strong foundational understanding of subtraction as a tangible action of ‘taking away’ that results in a smaller number.

Understanding Subtraction with Models – Models visualize subtraction – Use pictures/objects to subtract – Like crossing out items from a group – Models show ‘taking away’ – The model will have fewer items after subtraction – Example: 5 apples – 2 apples – Start with 5, take 2 away, and count what’s left | This slide introduces students to the concept of subtraction using models, which are visual representations that help them understand the process of ‘taking away.’ Encourage students to think of subtraction as removing some items from a group and then counting how many are left. Use simple and relatable examples, such as subtracting apples, to illustrate the concept. Show them how to use pictures or physical objects to represent the problem and solve it by removing the items being subtracted. This hands-on approach will help them grasp the idea of subtraction in a concrete way. During the lesson, provide various examples and allow the students to practice with their own models.

Subtraction Sentences from Models – Writing subtraction from a model – Picture model with 10 apples – Imagine you have 10 apples in front of you – Taking 3 apples away – If you give away 3 apples, how many do you have? – Subtraction sentence: 10 – 3 = 7 – We write this as 10 minus 3 equals 7 | This slide introduces students to the concept of creating subtraction sentences from visual models. Start by explaining that a model is a picture or representation of a real situation. Show them a picture with 10 apples and ask them to visualize taking 3 apples away. Guide them to understand that the subtraction sentence represents this action, with the number of apples left being the answer. Reinforce the concept by having students draw their own models and write corresponding subtraction sentences. Encourage them to use objects like counters or toys to physically represent the problem and solve it.

Your Turn to Try: Subtraction Practice – Receive objects for subtraction – Subtract the number I say – Count what remains – How many are left after taking some away? – Write the subtraction sentence – Example: 5 – 2 = 3 | This slide is an interactive activity for students to practice subtraction with physical objects. Provide each student with a set of small items (e.g., counters, blocks, or beans) up to 10. Instruct them to remove a certain number of items when you say a number. They should then count the remaining items to determine the answer. Guide them to write the corresponding subtraction sentence on their paper, reinforcing the concept that subtraction is taking away. For example, if they start with 5 items and you say ‘take away 2’, they should write ‘5 – 2 = 3’. Encourage students to double-check their work by recounting the remaining items. Offer praise for effort and correct answers, and provide assistance as needed.

Class Activity: Subtraction Bingo – Let’s play Subtraction Bingo! – Solve subtraction problems on your card – Use subtraction sentences up to 10 – Mark solved problems – Aim for five in a row to win! | This interactive class activity is designed to help first graders practice and reinforce their understanding of subtraction within 10. Prepare bingo cards in advance with different subtraction problems up to 10. Guide the students on how to solve the problems and mark their cards. Encourage them to use models or fingers to subtract if needed. The goal is to get five correct answers in a row, either horizontally, vertically, or diagonally. Possible variations of the game could include: 1) Group play, where students work in small teams, 2) ‘Blackout’ bingo, where the whole card must be filled, 3) ‘Four corners’ bingo, where only the four corners need to be marked, 4) ‘X’ bingo, where students mark problems in an ‘X’ pattern. This activity will not only make learning subtraction fun but also promote attention to detail and strategic thinking.

Subtraction Success! – Congratulations on learning subtraction! – Subtraction means taking away – Like 5 apples, eat 2, you have 3 left – Use bingo cards for practice – Each card has different subtraction problems – Keep practicing at home! | This slide is a positive reinforcement for students who have learned the basics of subtraction. It’s important to remind them that subtraction is simply the process of taking away from a group or number. Encourage them to continue practicing with their subtraction bingo cards, which provide a fun and interactive way to reinforce their skills. The bingo cards have a variety of subtraction problems up to 10, ensuring that students can practice with different numbers. Remind the students to practice at home with their parents or guardians and to bring any questions they have to the next class. Celebrate their progress and encourage a love for learning math.