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Relating Addition and Subtraction – Learn how addition & subtraction connect – Addition: Putting together, counting up – Example: 3 apples + 2 apples = 5 apples – Subtraction: Taking away, counting down – Example: 5 apples – 2 apples = 3 apples – Practice with examples & games | Today’s lesson is focused on helping students understand the relationship between addition and subtraction. Start by explaining that addition is about combining groups or counting up, and subtraction is about removing from a group or counting down. Use simple, relatable examples like adding and taking away apples to illustrate these concepts. Incorporate interactive games where students can practice creating addition and subtraction sentences from the same scenario. This will help them see the inverse relationship between the two operations. Encourage students to think of their own examples and share them with the class. The goal is for students to feel comfortable with the idea that addition and subtraction are connected and can help solve each other.

Understanding Addition – Addition means combining things – Like putting blocks together to make a tower – We add to find the total number – If you have 4 toys and get 3 more, count them all up! – Example with apples – Starting with 2 apples, then getting 3 more, we count 2, 3, 4, 5. Now you have 5 apples! | This slide introduces the concept of addition as a way of combining things to find a total. It’s important to use tangible examples that first graders can relate to, such as combining toys or apples. The example provided uses apples to illustrate how addition works in a real-world context. Encourage the students to visualize the process of starting with a certain number of items and then receiving more, counting up from the original number to find the total. This will help them understand the concept of addition as a method of finding out ‘how many in all’.

Understanding Subtraction – Subtraction means taking away – Subtract to find what’s left – Example with oranges – Start with 5 oranges, give 2 away, count how many left – Practice subtraction with items – Use toys or snacks to subtract and find the remaining | This slide introduces the basic concept of subtraction to first graders. Begin by explaining that subtraction is simply the process of taking some things away from a larger group. Use tangible examples, like oranges, to illustrate this point. For instance, if a student starts with 5 oranges and gives 2 away, they can physically count the remaining oranges to find the answer. Encourage students to practice with real objects such as toys or snacks to reinforce the concept. This hands-on activity will help them understand subtraction as a concrete action of removing items and counting what is left.

Relating Addition and Subtraction – Addition and subtraction opposites – Know total and one part, find other – Example: 2 + ? = 5 – If we have 2 apples and get more to make 5, how many did we add? – So, 5 – 2 = ? – If we have 5 apples and eat 2, how many are left? | This slide introduces the concept that addition and subtraction are related as inverse operations. Start by explaining that if we know the total amount and one part of a quantity, we can use subtraction to find the missing part. Use simple, relatable examples to illustrate this point. For instance, if we start with 2 apples and end up with 5, students should figure out how many apples were added. Conversely, if we have 5 apples and eat 2, they should determine how many are left. Encourage students to think of their own examples and to use physical objects like counters or drawings to visualize the problems. This will help solidify their understanding of the relationship between addition and subtraction.

Let’s Practice Together: Finding Missing Numbers – I’ll show a number sentence – You guess the missing number – We’ll use blocks and counters – Objects like blocks help visualize the problem – Example: 3 + ? = 7, so 7 – 3 = ? – If 3 plus something equals 7, subtracting 3 from 7 gives the missing number | This slide is an interactive class activity designed to help students understand the relationship between addition and subtraction. Display a number sentence with a missing number and encourage students to figure out the missing piece. Use tangible objects like blocks and counters to provide a visual aid, which can help them better grasp the concept of ‘taking away’ in subtraction. For example, if you have 7 items and you take away 3, how many are left? This activity will reinforce their understanding of how addition and subtraction are connected. Prepare several examples with varying difficulty and ensure to rotate around the classroom to assist students who might be struggling. Possible activities could include using different colored blocks, creating a number line on the floor, or having students come up to the board to solve a problem.

Subtraction as ‘Taking Apart’ – Subtraction means ‘taking apart’ – Break numbers into smaller ones – Example: 8 into 5 and 3 – Like breaking a cookie into pieces – 5 + 3 equals 8 shows this – Adding pieces together makes the whole | This slide introduces the concept of subtraction as a way of ‘taking apart’ a number into two smaller numbers. Use tangible examples like breaking a cookie into pieces to illustrate the point. For instance, if you have 8 cookies and you take 3 away, you are left with 5; thus, 8 can be ‘taken apart’ into 5 and 3. This helps students understand that addition and subtraction are related. Encourage students to think of subtraction as a method of breaking down numbers and to visualize the process with real objects or their fingers. This will help them grasp the concept of subtraction as an action of separation or removal.

Class Activity: Math Bingo! – Play Bingo with math problems – Solve to cover numbers on your card – Use addition and subtraction to find answers – Aim to cover a full row – Be the first to win Bingo! | This interactive Math Bingo game is designed to help first graders practice addition and subtraction within 20 in a fun and engaging way. Prepare bingo cards with a range of answers from addition and subtraction problems up to 20. During the game, call out math problems instead of numbers, and students will solve these problems and cover the corresponding answers on their cards. The first student to cover a full row horizontally, vertically, or diagonally shouts ‘Bingo!’ and wins. This activity encourages quick mental math skills and reinforces the relationship between addition and subtraction. Possible variations of the game can include using different operations, playing in pairs, or having a ‘blackout’ game where all answers must be covered.

Great Work on Addition and Subtraction! – Addition & subtraction connection – Practice is key to mastery – Use math bingo for fun practice – Math bingo cards help turn practice into a game – Keep up the good work at home! | Congratulations to the students for understanding the relationship between addition and subtraction. Emphasize the importance of regular practice to become more confident in their math skills. Encourage them to use the math bingo cards provided as a fun way to reinforce their learning at home. Remind them that learning math can be enjoyable and that they should be proud of their progress. Offer some tips for parents to help their children practice, such as setting a regular time for math games and praising effort and improvement.