Transcript Miss Koch`s Fact Families

FACT FAMILIES
Miss Koch
http://ictgames.com/funkymum.html
Now that we are warmed up, Let’s get
started practicing our fact families!
What is a Fact
Family?
What does the top number in a fact
family represent?
8
7
What would the SUM for this fact
family be?
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
8
7
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= 6
What facts belong in this fact family?
14
5
9
Good Job! Now, we are
going to try some
problems where YOU
find the numbers in the
fact family!
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?
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
=
17
8
9
Alright, Let’s see those math facts!
8+9= 17
9+8 = 17
17-8 = 9
17-9 =8
Let’s Try Another One!
7
9
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
On your wipe off board everybody write
me a number sentence that has a sum of
Does everybody have the
same number sentence?
Not all fact families that have
the same SUM are going to
have the same addends!
4
2
4
2
3
1
Let’s create a fact family!
Who can tell me TWO numbers that
add up to 13?
13
Let’s try another fact family that has a SUM of 13,
but has different addends!
What are two DIFFERENT
Numbers that add up to 13?
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
If we are not given the SUM in a fact family,
how do we find it?
6
4
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
2
4
2
3
1