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RCN Lesson 2: Equations on a Number-line

Last updated over 2 years ago
5 questions
Note from the author:
Develop Understanding
Today's Learning Goal (G2, U4, L8):
  • Use number line diagrams to represent and write addition and subtraction equations.
Today's Materials:
  • Laptop
  • Laptop charger
  • Pen/Pencil/Paper (optional)
Please complete the Jump Start (activator). You have 5 minutes before we review. This is independent it should be silent.

Reminders:
1.) Ready for class.
2.) Volume is at minimum.
3.) No cellphones.
4.) Read and follow all directions.
5.) Take your bag off and begin the activator immediately.
Develop Understanding
Today's Learning Goal (G2, U4, L8):
  • Use number line diagrams to represent and write addition and subtraction equations.
Today's Materials:
  • Laptop
  • Laptop charger
  • Pen/Pencil/Paper (optional)
Please complete the Jump Start (activator). You have 5 minutes before we review. This is independent it should be silent.

Reminders:
1.) Ready for class.
2.) Volume is at minimum.
3.) No cellphones.
4.) Read and follow all directions.
5.) Take your bag off and begin the activator immediately.
Required
1

Jump Start Activator- (3-5 minutes)

Choral Count: Back by 10
  • Count back by 10, starting at 99.
  • Count back by 10, starting at 98.
  • Count back by 10, starting at 95.
What patterns do you see?


  • Remember to NOT shout the answer! The question should be answered MENTALLY. Give me a signal when you have a PATTERN and explain how you got it.



Launch: Number Talk - (5-10 minutes)

Today we will cover addition and subtraction equations represented on a number line.


How can you tell whether a number line is representing addition or subtraction? Talk to your group quitely

EXPLORE A1: REPRESENT EQUATIONS- (15 min)

I'll model a. and we will do b. together.
1

EXPLORE A2 - WRITE EQUATIONS- (15 min)

In groups of 2-3 you are going to look at number lines and write equations that match the diagram. Compare your equations with your partner. Take turns explaining how your equation matches the number line diagram. Then work together to choose two number lines that you think are the most alike. Be prepared to explain your choice.

I'll model (a.) we will do (b.) together
Required
1

Complete (c.- f.)

Lesson Synthesis- (5-10 minutes)

1

How could you explain to a friend how they could use the number line to show addition and subtraction
(Hint: Think about the previous lesson about story problems)

COOL DOWN - (5 MIN)

1

KHAN ACADEMY FOR THE LAST 30 MINUTES OF MATH INTERVENTION!!

Closure Questions

  • How can you use a number line to represent equations using addition and subtraction?
  • What method you found most effective when representing equations using addition and subtraction (e.g., tape diagram, number line diagram, etc.)
  • ¿Cómo puedes usar una recta numérica para representar ecuaciones usando sumas y restas
  • ¿Qué método encontró más efectivo al representar ecuaciones usando sumas y restas (por ejemplo, diagrama de cinta, diagrama de recta numérica, etc.)