Fact Families
For every fact family, how many equations can you write?
Four.
2 addition and 2 subtraction.
What addition fact can you write for this equation:
13 - 5 = ?
5 + ? = 13
What is the doubles fact?
6 + 6 =
6 + 6 = 12
Using part and whole, what is addition?
PART + PART = WHOLE
Using part and whole, what is subtraction?
WHOLE - PART = PART
Write the fact family for:
3, 7, 4
3+4=7
4+3=7
7-3+4
7-4=3
Which two addition equations relate to this subtraction equation?
14 - 6 = 8
6 + 8 = 14
8 + 6 = 14
What doubles fact can help with
8 - 4 =?
4 + 4 = 8
What is the WHOLE in this equation?
17 - 6 = 11
17
What are the PARTS in this equation?
8 = 10 - 2
2 and 8
Write the fact family for:
19, 13, 6
13+6=19
6+13=19
19-13=6
19-6-13
? - 5 = 11
We know 5 and 11 are both parts.
Addition is PART + PART = WHOLE
So, 5 + 11 = ? is the related fact
5 + 11 = 16.
Draw a picture to show how you can use doubles for this equation:
12 - 7 =
We know that 12 - 6 = 6
(6 + 6 = 12)
SO 12 - 7 = 5
What is wrong with the following equation?
13 + 7 = 6
It isn't right.13 + 7 = 20
BUT 13 -7 = 6
Piper has 11 cookies.
She eats 2 of the cookies.
How many cookies does she have left?
Write the equation and answer.
11 - 2 = 9
9 cookies are left
Which equations belong in the fact family 5, 14, 9?
14 - 9 = 5
14 + 5 = 19
9 + 5 = 14
5 - 9 = 14
14 - 9 = 5
9 + 5 = 14
Harper has 12 balloons.
4 float away. How many are left?
Write a subtraction equation AND an addition equation to match the problem.
12 - 4 = ?
4 + ? = 12
The missing part is 8.
Show how you can use doubles. Draw your response.
14 - 6 =
We know that 14 - 7 = 7
7 + 7 = 14)
SO 14 - 6 = 8
Solve this equation for the unknown:
16 - ? = 9
16 - 7 = 9
7 + 9 = 16
Is this true or false?
13 - 3 = 14 - 2
False
13 - 3 = 10
14 - 2 = 12
So 10 DO NOT EQUAL 12