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Welcome to Subtraction! – Learning to take away numbers – Subtraction shows how many left – If you have 5 apples and eat 2, subtraction tells you 3 are left. – Using number lines for subtraction – A number line helps us see the ‘taking away’ by jumping backwards. – Practice makes perfect – We’ll do fun activities to get really good at this! | This slide introduces first graders to the concept of subtraction as a means of determining how many items remain after some have been taken away. Emphasize that subtraction is simply ‘taking away’ and use relatable examples, like apples, to illustrate this point. Introduce the number line as a visual aid to help them understand and visualize the process of subtraction. Encourage the students to practice by using number lines to subtract numbers up to 20, and assure them that with practice, they will become subtraction experts. Plan a series of engaging activities where students can physically move objects or themselves along a number line to reinforce the concept.

Understanding Subtraction – Subtraction means taking away – Finding the difference between numbers – It’s the result after taking some away – Like giving away cookies – Imagine having 5 cookies and giving 2 away – How many cookies left? – Use a number line to count back and see | This slide introduces the concept of subtraction to first graders by relating it to a tangible example, such as giving away cookies. Start by explaining that subtraction is the process of taking away items from a group. The difference is the number that remains after some are taken away. Use a simple story or visual aids like actual cookies or illustrations to show subtraction in action. For instance, if you have 5 cookies and you give 2 away, how many are left? Encourage the students to use their fingers or a number line to count backward from 5 to find the answer. This will help them visualize the subtraction process and understand that the number of items decreases as we subtract.

Subtraction with Number Lines – Number lines show numbers visually – Start at the bigger number – If we have 15 – 4, we start at 15 on the number line – Hop backwards to subtract – Count back 4 hops from the starting number – Each hop decreases by one – Observe how the number gets smaller with each hop | This slide introduces students to the concept of using a number line for subtraction. A number line is a visual tool that helps students understand the relationship between numbers and the process of counting back. Begin by explaining that subtraction is like taking away or ‘hopping back’ on the number line. Demonstrate with an example, such as starting at 15 and ‘hopping back’ 4 spaces to land on 11, which is the answer to 15 – 4. Emphasize that each hop represents subtracting one and that the numbers decrease as we move left on the number line. Encourage students to practice with different subtraction problems up to 20 using this method.

Let’s Try Together: Subtraction with Number Lines – Start at 10 on the number line – Hop back 4 spaces – Each hop back represents subtracting 1 – See where we land – The number we land on is the result – Discover the answer – 10 – 4 lands us on 6 | This slide is an interactive class activity designed to help first graders understand subtraction using a number line. Begin by explaining that a number line is a tool we can use to count forwards for addition and backwards for subtraction. Demonstrate the subtraction of 4 from 10 by physically moving or pointing along a number line in the classroom. Encourage the students to count aloud each ‘hop’ back as you move from 10 to 6. After completing the example, ask students to try similar subtraction problems with their own number lines, guiding them to ‘hop back’ the correct number of spaces to find the answer. This visual and physical activity helps solidify the concept of subtraction as ‘taking away’ from a total amount.

Your Turn to Subtract with Number Lines – Use your number line for 7 – 3 – Start at number 7 – Hop back 3 spaces – Where did you land? – This shows us 7 – 3 equals 4 | This slide is an interactive activity for students to practice subtraction using a number line. Encourage the students to take out their number lines and physically point to the number 7. Then, guide them to move back three spaces, one for each number they subtract. This visual and physical activity helps solidify the concept of subtraction as ‘taking away.’ After completing the exercise, ask the students to share where they landed and discuss the result of 7 – 3. Provide additional examples if time allows and ensure each student is comfortable with the process before moving on.

Understanding Subtraction Sentences – Subtraction sentence parts – Whole, part taken away, part left – Example: 8 – 2 = 6 – From 8 take away 2, we have 6 left – Use number lines for checking – Place a finger on 8, jump back 2 steps to land on 6 – Practice with different numbers | This slide introduces first graders to the concept of subtraction sentences using number lines. Start by explaining that a subtraction sentence is made up of three parts: the total amount (whole), the amount we remove (part taken away), and the amount that remains (part left). Use the example 8 – 2 = 6 to illustrate this concept. Show how to use a number line by starting at the whole number (8) and moving backwards two spaces to find the answer (6). Encourage students to practice with different numbers up to 20, using number lines to visually confirm their answers. This hands-on approach helps solidify their understanding of subtraction as ‘taking away’ and reinforces the relationship between numbers in a subtraction sentence.

Practice Time: Subtraction Sentences with Number Lines – Practice writing subtraction sentences – Use number lines for answers – A number line helps us see the ‘jump back’ to subtract – Partner up for sentence creation – Two heads are better than one! Help each other find the difference. – Share your sentences with the class – Explain how you got your answer when you share | This slide is designed to engage students in a hands-on activity to reinforce their understanding of subtraction using number lines. Encourage students to work in pairs to foster collaboration and peer learning. Each pair should create their own subtraction sentences and use a number line to find the answers. This will help them visualize the subtraction process as a backward movement along the number line. After creating their sentences, pairs will share their work with the class, explaining their thought process and how they used the number line to arrive at their answers. This activity not only solidifies their understanding of subtraction but also enhances their communication skills. Provide guidance and support as needed, and ensure each student is actively participating.

Class Activity: Subtraction Hunt – Let’s go on a subtraction hunt! – Find objects to subtract in class – Use 5 pencils minus 2 as an example – For example, if you have 5 pencils and give away 2, how many are left? – Write the subtraction sentence – Use your number line to show 5 – 2 and write ‘5 – 2 = 3’ | This interactive activity is designed to help first graders understand subtraction by physically finding objects around the classroom to subtract from one another. Encourage the students to use tangible items like pencils, erasers, or blocks for a hands-on experience. Guide them to use their number lines to visually represent the subtraction problem they’ve created with the objects. For instance, if a student picks 5 pencils and decides to ‘subtract’ 2 pencils, they should use the number line to count back two spaces from 5 to find the answer. After finding the answer, they will write the complete subtraction sentence. Provide several examples and ensure that each student has a number line to use. Rotate around the room to assist and check on students’ progress. Possible variations of the activity could include subtracting different amounts or using different objects to keep the activity engaging and cater to different learning paces.

Becoming Subtraction Stars! – Celebrating our subtraction skills – Subtraction shows what’s left – When we take away, we see how many remain – Practice makes perfect – The more we practice, the better we get! – Keep up the great work! | This slide is meant to wrap up the lesson on subtraction using number lines and to reinforce the students’ understanding and confidence. Emphasize the importance of subtraction as a tool to find out the remaining quantity after some are taken away. Encourage the students to continue practicing with different numbers up to 20 to become proficient. Acknowledge their hard work during the lesson and motivate them to keep practicing. You can suggest that they use toys or snacks at home to create their own subtraction problems and use a drawn or imaginary number line to solve them.