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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 with examples up to 10 – Let’s try: 10 – 4. Start at 10 on the line, jump back 4 steps to land on 6. | This slide introduces the concept of subtraction to first graders. Emphasize that subtraction is simply ‘taking away’ and helps us figure out what remains. Use relatable examples like toys or snacks to illustrate the point. Demonstrate how a number line can visually represent subtraction by physically moving backwards to ‘take away’ a number. Provide several examples using a number line with numbers up to 10, ensuring students understand the concept of ‘jumping back’ to find the answer. Encourage students to use their fingers to follow along on their own number lines.

Understanding Subtraction – Subtraction means taking away – Finding the difference between numbers – If you have 10 toys and give away 2, how many do you have left? – Like giving away some apples – Imagine starting with 5 apples and 2 are taken away – Using a number line to subtract – We’ll jump backwards on the line to take away | This slide introduces the basic concept of subtraction to first graders. Subtraction is explained as the process of taking away from a total amount. Use tangible examples like apples or toys to illustrate the concept, as this helps young learners to visualize the process. Demonstrate how a number line can be used to subtract by physically jumping backwards to represent taking away. During the class, use real objects or illustrations to show subtraction in action. Encourage students to use their fingers or counters to practice subtracting on a number line up to 10. This will help solidify their understanding of finding the difference between two numbers.

Subtraction with Number Lines – Number lines show subtraction – Start at a number, hop back – If we start at 10 and take away 2, we hop back twice to land on 8 – Each hop is one less – Practice with examples – Example: 10 – 2 = 8, shown with two hops back on the line | This slide introduces first graders to the concept of using a number line to understand subtraction. Explain that a number line is a visual tool that helps us count forwards for addition and backwards for subtraction. Demonstrate how to ‘hop’ backwards on the number line to subtract one number from another, emphasizing that each hop represents subtracting one unit. Use simple examples, such as starting at 10 and hopping back 2 spaces to land on 8, to illustrate the concept. Encourage students to practice with different starting numbers and subtraction values to reinforce the lesson.

Let’s Practice Subtraction with Number Lines! – Example subtraction: 5 – 2 = ? – Start at number 5 on the line – Imagine standing on number 5 – Hop back 2 spaces to find answer – Each hop takes you one number lower – Discover the answer together | This slide is an interactive class activity to help students understand subtraction using number lines. Begin with the example 5 – 2 = ?. Have students visualize standing on number 5 on the number line. Then, guide them to hop backwards two spaces, emphasizing that each hop represents subtracting one. After two hops, they land on the number 3, which is the answer. Encourage students to count aloud as they hop. For the activity, provide different subtraction problems and let students come up to the board to demonstrate. Possible variations include using physical number line mats, having students draw their hops, or pairing students to practice together.

Your Turn to Try: Subtraction with Number Lines – I’ll give you a subtraction problem – Use your number line to solve it – Start at the first number, then hop backwards – Find the answer on the line – Each hop is one less. Count the hops to subtract – Ready? Let’s subtract together! | This slide is an interactive activity for students to practice subtraction using number lines. Present a subtraction sentence, such as ‘5 – 3’. Have students use their number lines to find the starting number (5) and make backward hops to subtract (3 hops back). They should land on the answer (2). This visual and physical activity helps solidify the concept of subtraction as ‘taking away’. Encourage students to verbalize their process as they go along. For example, ‘Starting at 5, if I take away 3, where do I land?’ This reinforces the connection between the action of subtracting and the number line. Prepare to guide them through several examples, and praise their efforts to build confidence.

Writing Subtraction Sentences – Subtraction sentences structure – It looks like: Start number – Number we take away = Answer – Start with the larger number – Subtract the smaller number – Find the difference using a number line – Example: If we have 7 and take away 3, we jump back 3 spaces on the number line to land on 4 | This slide is aimed at helping first graders understand the structure of subtraction sentences using number lines. Begin by explaining the basic format of a subtraction sentence, emphasizing that we always start with the larger number and subtract the smaller number from it. Use a number line to visually demonstrate how to count backwards to find the answer. For instance, if we have 7 and we need to subtract 3, we start at 7 on the number line and make 3 jumps backwards to land on 4, which is our answer. Encourage students to practice with different numbers up to 10, using number lines to visually support their subtraction.

Number Line Hopscotch: Subtraction Fun! – Let’s play Number Line Hopscotch! – Draw a number line from 0 to 10 – Use chalk to draw a line with numbers 0 through 10 spaced out – Hop to subtract numbers – Start at a number, then hop backwards to subtract – Solve subtraction problems together | This interactive class activity is designed to help first graders understand subtraction by physically moving along a number line. Teachers should assist students in drawing a number line on the floor with chalk, ensuring numbers are spaced out enough for hopping. Demonstrate how to solve a subtraction problem by starting on the minuend, hopping backwards the number of spaces equal to the subtrahend, and landing on the difference. Encourage students to take turns and help each other. Possible variations include calling out different subtraction problems for each student, pairing students to challenge each other, or creating a hopscotch tournament with subtraction problems.

Becoming a Subtraction Star! – Congratulations on learning subtraction! – Subtraction shows what’s left after taking away – If you have 10 apples and eat 2, subtraction tells you 8 are left. – Practice makes perfect in subtraction – The more you practice, the quicker you’ll solve problems! – You’re on your way to being a subtraction star! | This slide is meant to celebrate the students’ accomplishment in learning how to use number lines for subtraction. It’s important to reinforce the concept that subtraction is a way to find out the remaining quantity after some has been taken away. Encourage the students to continue practicing with different numbers up to 10 to become confident in their subtraction skills. Praise their efforts and progress, and motivate them to aim for mastery, which will make them subtraction stars. You can suggest that they practice with their toys, snacks, or pencils at home to make learning fun and relatable.