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# Lesson Plan

## Subtraction - Subtract on Number lines to 20

### First (1) - Math

### LEARNING TARGET

- Students will be able to use number lines to solve subtraction sentences.
- Students will be able to subtract numbers up to 20 using number lines.
- Students will be able to identify the difference between two numbers when given a subtraction sentence.

### LEARNING PROGRESSION

###### PREREQUISITE SKILL

- Students will be able to identify numbers on a number line.
- Students will be able to use a number line to add numbers to 20.
- Students will be able to solve addition problems involving numbers up to 20 using a number line.

###### EXTENSION SKILL

- Students will be able to use the subtraction strategy of counting back on a number line to solve subtraction sentences with 20.
- Students will be able to identify the correct direction to count back on a number line.
- Students will be able to solve subtraction problems involving numbers up to 20.

###### DURATION

45-55 minutes

###### MATERIALS

- Whiteboard and markers
- Number line posters or printed worksheets
- Subtraction worksheet pack
- Counters or manipulatives (optional)

###### VOCABULARY

- Subtract
- Minus
- Difference
- Number line

### TEACHING RESOURCES

###### CENTERS & TASK CARDS

No Centers or Task Cards Available

###### IEP GOAL WORKBOOKS

###### WORKSHEET PACK

Boost your first-graders' subtraction skills with our worksheet pack! Includes problems up to 20, using number lines as a strategy. Perfect for homework or extra practice!

**Included printable worksheets**

- Guided Practice
- Independent Practice
- Homework
- Exit Ticket I
- Exit Ticket II
- Progress Monitoring I
- Progress Monitoring II
- Assessment

###### 5 AND 1 INTERVENTIONS

No Interventions Available

###### GAMES

###### ACTIVITIES

No Activities Available

### LESSON INSTRUCTION

###### INTRODUCTION

- Begin the lesson by reviewing the concept of subtraction and its symbol, the minus sign (-).
- Display a number line poster and explain to students that they will be using number lines to help them solve subtraction problems.
- Show an example of a subtraction problem on the board, such as 10 - 3, and ask students if they know how to solve it.
- Explain that they can use the number line to help them find the difference between the two numbers.

###### INSTRUCTION

- Demonstrate to the students how to use a number line to solve a subtraction problem. Begin with the same example as before, 10 - 3.
- Show how to start at 10 on the number line and count back 3 spaces to find the difference, which is 7.
- Write the subtraction sentence 10 - 3 = 7 on the board.
- Provide additional examples and have students practice using number lines to solve subtraction problems.

###### GUIDED PRACTICE

- Provide students with a subtraction worksheet containing problems that use numbers up to 20.
- Work through the problems together as a class, demonstrating how to use the number line to solve each problem.
- Encourage students to write the subtraction sentences for each problem on their worksheet.

###### INDEPENDENT PRACTICE

- Provide students with another subtraction worksheet to complete independently.
- Encourage students to use the number line to help them solve the problems.
- Circulate around the room to provide individual support and guidance as needed.
- For students who need extra support, provide them with counters or manipulatives to help them count back on the number line.

###### HOMEWORK

- Assign a set of subtraction problems for homework that use numbers up to 20.
- Encourage students to use the number line to help them solve the problems.

###### EXIT TICKET

- To assess students' understanding of using number lines to solve subtraction problems, provide each student with an exit ticket that contains four subtraction sentences and four corresponding blank number lines.
- Instruct students to solve each subtraction sentence and draw a corresponding model on the number line provided.
- Collect the exit tickets to quickly assess students' understanding of the concept and identify any areas that may require further instruction or support.

###### ASSESSMENT

- To assess students' understanding of using number lines to solve subtraction problems, provide each student with an assessment sheet that contains several subtraction sentences and blank number lines.
- Instruct students to solve each subtraction sentence and draw a corresponding model on the number line provided.
- Collect the assessment sheets to evaluate students' understanding of the concept and identify any areas that may require further instruction or support.

###### CLOSURE

- Recap with the class what they learned in the lesson about using number lines to solve subtraction problems.
- Encourage students to reflect on how they can apply this strategy in future math lessons and in everyday situations.

###### EXTENSION

- For students who have mastered subtracting numbers up to 20 using number lines, provide them with more challenging subtraction problems that involve regrouping or borrowing.
- Students can practice subtracting three or more numbers using number lines.
- Students can create their own subtraction problems using number lines and exchange with a partner to solve.

###### INTERVENTION

- For students who struggle with fine motor skills or have difficulty manipulating the number line, provide them with larger or easier-to-grasp manipulatives, such as a jumbo number line or a tactile number line.
- For students who need extra support, provide them with additional practice problems and one-on-one guidance during independent practice.
- For students who need additional reinforcement, provide them with visual aids, such as posters or anchor charts, that illustrate how to use the number line to solve subtraction problems.

###### VIDEOS

No Video Available

### TEACHING TIPS

- Encourage students to draw pictures or use manipulatives to help them visualize the subtraction problem on the number line.
- Remind students to start at the larger number and count back to the smaller number to find the difference.
- Provide additional practice problems for students who need extra support or challenge.

### STUDENT MISCONCEPTIONS

- Students may think that they have to start at zero on the number line for every problem.
- Students may forget to count backwards when using the number line to solve subtraction problems.
- Students may have difficulty identifying the difference between the two numbers in the subtraction sentence.

### STANDARD

##### Common Core Standard:

1.OA.C.5 - Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

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