Module 2.4 Working with Count- On Fact Families. What is missing? How do you know? Working with Count- On Fact Families.

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Presentation transcript:

Module 2.4 Working with Count- On Fact Families

What is missing? How do you know? Working with Count- On Fact Families

What is missing? How do you know?

Working with Count- On Fact Families

What is missing? How do you know?

Working with Count- On Fact Families

I need 6 volunteers. Four of you stand on the right and two of you stand on the left. Four birds were sitting on a fence. Two more birds flew over to join them. How many birds were there in total? What number sentence can we write on the board to match the story? What numbers are the “parts” and what number is the “total?” Working with Count- On Fact Families

Turnaround Facts- the same numbers in each sentence are used to describe the parts and total. Working with Count- On Fact Families Related Facts- subtraction facts do not have turnarounds, because trying to turnaround a subtraction fact in the same way as a addition fact creates sentences that are not true.

Turnaround Facts- the same numbers in each sentence are used to describe the parts and total. Working with Count- On Fact Families Related Facts- Turning Around” subtraction facts creates related facts.

Fact Families- two addition facts and two subtraction facts that involve the same parts and total are called a fact family These are two parts. What is the total? What is the fact family? Working with Count- On Fact Families

What is the fact family? Working with Count- On Fact Families

What is the fact family? Working with Count- On Fact Families

Math Groups Rotation Independent Work 1.Page Addition Dice Teacher Bring Book to Mrs. Davis’ Table Fluency 1.Slide +/- 1 PINKYELLOWORANGE 2 PINKYELLOW 3 ORANGEPINK

Reflection These are the parts. What addition facts and subtraction facts can wee write? What is another pair of numbers that will have a fact family in which the facts are like these? Does anyone know what we call these pairs of numbers? Doubles