FACT FAMILIESMiss Koch

First, we are going to practiceSome of our addition facts!!

http://ictgames.com/funkymum.html

Let’s Try to Get 10 Problems Correct!!!

Now that we are warmed up, Let’s get started practicing our fact families!

What is a Fact Family?

8 7

What does the top number in a fact family represent?

Good Job! The Top NumberIn a Fact Family

Represents the SUM!

8 7

What would the SUM for this fact family be?

15Good Job!!!

8 7

Now that we found that the sum of 8+7=15, lets find the rest of the Facts in this family together!

15

Write the facts that belong in the fact family:

13

6 7

Does your fact family look like this?

6 + 7= 13

7 + 6 = 13

13-6= 7

13-7= 6Good Job!

14

5 9

What facts belong in this fact family?

Good Job! Now, we are going to try some problems where YOU find the numbers in the fact family!

8 9

Before we can find out the facts in this family we need to find the SUM!

Who can tell me how we are going to find the sum?

17

8 9

Now that we found out that the sum of 8+9=17, write the facts that are in this fact family On your wipe off board!

8 + 9 =

Alright, Let’s see those math facts!

17-8 = 9

9+8 = 17

8+9= 17

17-9 =8

Let’s Try Another One!

7 9

What do we need to do first?

Terrific! The sum of 9+7= 16

Let’s See The Facts From this Family!

16

9 7

9+7=16

7+9=16

16-9=7

16-7=9

Do your answers look like this?

On your wipe off board everybody write me a number sentence that has a sum of

Does everybody have the same number sentence?

Number sentences with 13 as the sum:

Not all fact families that have the same SUM are going to have the same addends!

4 4

2 2 3 1

Let’s create a fact family!

13

Who can tell me TWO numbers that add up to 13?

Let’s try another fact family that has a SUM of 13, but has different addends!

13

What are two DIFFERENTNumbers that add up to 13?

Let’s Create a fact family with a sum of 15!

15

Let’s try a fact family that has a sum of 18

18

LET’S PICK A NUMBER 13 14 or 15, THIS IS GOING TO BE THE SUM IN OUR FACT FAMILY.

LET’S MAKE A FACT FAMILY TOGETHER!

LET’S PICK A NUMBER 16 17 or 18 , THIS IS GOING TO BE THE SUM IN OUR FACT FAMILY.

LET’S MAKE A FACT FAMILY TOGETHER!

GREAT JOB AT PRACTICE, NOW, LETS TRY SOME PROBLEMS ON OUR OWN!

Great Job Today, Let’s Have A Quick Review!

What does the number in the top of the triangle of a fact family represent?

4

2 2

6 4

If we are not given the SUM in a fact family, how do we find it?

If 2 fact families have the same sum, do they always have to have the same addends?

No, fact families with the same SUM do not have to have the same addends!

4 4

2 2 3 1

GREAT

JOB!

GREAT

WORK TODAY!