Fact Family Fun: Building Number Houses!

Mathematics Grades 2nd Grade 21:41 Video
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Lesson Description

Learn about fact families, how addition and subtraction are related, and build number houses to show these relationships!

Video Resource

Grade 2: Math - Fact Families Worksheet | Kids Academy

Kids Academy

Duration: 21:41
Watch on YouTube

Key Concepts

  • Fact families consist of three numbers.
  • Addition and subtraction are related operations.
  • The biggest number in a fact family is used in subtraction problems.
  • Understanding the concept of 'making sense' in math problems.

Learning Objectives

  • Students will be able to identify the numbers in a fact family.
  • Students will be able to write two addition and two subtraction equations for a given fact family.
  • Students will be able to determine if a set of facts form a fact family.
  • Students will be able to relate addition to subtraction through the concept of fact families.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing addition and subtraction. Ask students what they know about related facts. Introduce the term 'fact family' and explain that it's like a family of numbers that always go together.
  • Video Viewing (10 mins)
    Play the Kids Academy video 'Grade 2: Math - Fact Families Worksheet | Kids Academy'. Encourage students to pay attention to how the 'number house' is used to organize fact families.
  • Building Number Houses (15 mins)
    Guide students to create their own number houses on paper. Use examples from the video (9, 13, 22 and 17, 8, 25) to demonstrate how to fill in the house with the correct numbers. Emphasize that the largest number goes at the top of the house (in the roof). Then write out the four equations that belong to the fact family – two addition and two subtraction.
  • Worksheet Practice (15 mins)
    Provide students with a worksheet containing various sets of numbers. For each set, they should first determine if it forms a fact family. If it does, they should create a number house and write out the four related equations. If not, they should explain why it doesn't work.
  • Wrap-up (5 mins)
    Review the concept of fact families and their relationship to addition and subtraction. Ask students to share any challenges they faced and how they overcame them.

Interactive Exercises

  • Fact Family Sort
    Create a set of cards, some with fact family equations and some with unrelated equations. Have students sort the cards into two piles: 'Fact Family' and 'Not a Fact Family'.
  • Number House Game
    Divide students into small groups and give each group a set of three numbers. Have them work together to create a number house and write out the four related equations. The first group to correctly complete the task wins.

Discussion Questions

  • What is a fact family?
  • How are addition and subtraction related?
  • Why does the biggest number go at the top of the number house?
  • How can you check if a set of numbers forms a fact family?

Skills Developed

  • Addition
  • Subtraction
  • Problem-solving
  • Critical thinking
  • Number sense

Multiple Choice Questions

Question 1:

Which three numbers make a fact family?

Correct Answer: 5, 6, 11

Question 2:

In a fact family house, where does the biggest number go?

Correct Answer: On the roof

Question 3:

Which equation is part of the fact family for 4, 6, and 10?

Correct Answer: 10 - 4 = 6

Question 4:

Fact families help you understand how _______ and _______ are related.

Correct Answer: Adding and subtracting

Question 5:

Which of these is NOT part of the fact family for 3, 7, and 10?

Correct Answer: 7 - 3 = 4

Question 6:

What do you need to start with when doing subtraction problems from fact families?

Correct Answer: Biggest number

Question 7:

What is the missing number in this fact family: 8 + 5 = ___, 13 - 5 = 8

Correct Answer: 13

Question 8:

Which sign would you use to put fact families together?

Correct Answer: +

Question 9:

What does it mean if a number is 'making sense' when doing fact family problems?

Correct Answer: Answer is correct

Question 10:

How many addition problems and subtraction problems are in a fact family?

Correct Answer: 2 addition, 2 subtraction

Fill in the Blank Questions

Question 1:

A fact family is a group of _______ numbers that are related.

Correct Answer: three

Question 2:

Addition and _______ are part of fact families.

Correct Answer: subtraction

Question 3:

In a fact family house, the _______ number goes on the roof.

Correct Answer: biggest

Question 4:

The equation 5 + 3 = 8 is part of a fact family. What is the subtraction problem for this fact family, starting with the biggest number? 8 - 5 = _______

Correct Answer: 3

Question 5:

If you know 2 + 7 = 9, then you also know 7 + _______ = 9.

Correct Answer: 2

Question 6:

Fact families help us see how numbers _______ together.

Correct Answer: go

Question 7:

If 12 - 4 = 8, then one related addition fact is 4 + 8 = _______

Correct Answer: 12

Question 8:

When something 'makes sense' then it _______ is correct.

Correct Answer: answer

Question 9:

If one of the four numbers does not _______, then it is not part of the fact family.

Correct Answer: work

Question 10:

Remember, there are _______ ways we can write fact families.

Correct Answer: four

Educational Standards

2.N.2.1:Use the relationship between addition and subtraction to generate basic facts with sums and minuends of up to 20. 2.N.2.2:Demonstrate fluency with basic facts of addition and subtraction with sums and minuends of up to 20. 2.A.2.3:Apply the commutative property, identity property, and number sense to find values for unknowns that make addition and subtraction number sentences true or false.

Teaching Materials

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