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Definitions
Addend - Any number being added.
6 + 5 = 11 Inverse Operation - An opposite
operation that undoes another.
5 + 4 = 9 9 - 5 = 4
Let’s Review
Addition/Subtraction Fact Families are found by: Starting with a simple addition fact. ( 2
+ 5 = 7) Changing the addends around. (5 + 2 = 7) Writing the Inverse operations for both. (7 - 2 = 5 & 7 - 5 = 2)
Definitions
Factors - The numbers being multiplied.
4 x 8 = 32 Inverse Operation - An opposite
operation that undoes another. 4 x 8 = 32 32 / 4 = 8
Multiplication
Multiplication/Division Fact Families are found by:
Starting with a simple multiplication fact. ( 3 x 9 = 27)
Changing the Factors around. (9 x 3 = 27) Writing the Inverse operations for both. (27 / 3 = 9 & 27 / 9 = 3)
What are the 4 members of the Fact Family of
3 x 7 = 21?
3 x 7 = 21 7 x 3 = 21 21 / 3 = 7 21 / 7 = 3
model
What are the 4 members of the Fact Family of
6 x 4 = 24?
6 x 4 = 24 4 x 6 = 24 24 / 6 = 4 24 / 4 = 6
Multiplication/Division Fact Families are found by:
Starting with a simple multiplication fact. ( 3 x 9 = 27)
Changing the Factors around. (9 x 3 = 27) Writing the Inverse operations for both. (27 / 3 = 9 & 27 / 9 = 3)
What are the 4 members of the Fact Family of
7 x 8 = 56?
7 x 8 = 56 8 x 7 = 56 56 / 7 = 8 56 / 8 = 7
Guided
What are the 4 members of the Fact Family of
9 x 7 = 63?
9 x 7 = 63 7 x 9 = 63 63 / 9 = 7 63 / 7 = 9
Multiplication/Division Fact Families are found by:
Starting with a simple multiplication fact. ( 3 x 9 = 27)
Changing the Factors around. (9 x 3 = 27) Writing the Inverse operations for both. (27 / 3 = 9 & 27 / 9 = 3)
CFU
Closure
A fact family will have two multiplication problems and two division problems.
Inverse Operation - An opposite operation that undoes another.
3x4=12 *** 12/ 4 = 3
Independent Practice
Write a multiplication and division fact family for the following:
1) 5 x6 = 30 6) 9x8 = 72 2) 8x3 = 24 7) 4x8 = 32 3) 7x2 = 14 8) 3x9 = 27
4) 6x8 = 48 9) 9x 2 =18
5) 2x4 = 8 10) 4x 6 = 24
Answers
1) 5 x6 = 30 6x5=30 30/6=5 30/5=6 2) 8x3=24 3x8=24 24/8=3 24/3=8 3) 7x2=24 2x7=14 14/2=7 14/7=2 4) 6x8=48 8x6=48 48/6=8 48/8=6 5) 2x4=8 4x2=8 8/4=2 8/2=4