Properties
What property does this show?
(3x4) x 2 = 3 x (4 x 2)
Associative property!
The parenthesis move!!!
What is the product of 4 x 12?
48!
What property does this show?
4x45 = (4x40) + (4x5)
Distributive property!
What is 10 x 4?
40!
8 x 400
3,200
What property is this showing?
8 x 9 = 9 x 8
Commutative property!
What is the product of 43 and 5?
215!
What equation am I showing you?
(7 x 30) + (7 x 5) = ?
7 x 35!
100 x 6 = ?
600!
9 x 36 = ?
324
What property does this show?
3 x 75 = (3x70) + (3x5)
Distributive property!
89 x 2 = ?
178
What equation am I showing you AND what is the answer!
(4 x 20) + (4 x 2) = ?
4 x 22 = 88!
What is the product of 6 and 300?
1,800
9 x 72 = ?
648
What property does this show?
4 x (5 x 6)= 4 x (6 x 8)
NOTHING because the numbers DO NOT MATCH!
Solve this:
(5x60) + (5x2) =
5 x 62 = 310
Ms. Wright tried to solve this equation on her own:
5 x 300
What is wrong with what Ms. Wright did?
5 x 3 = 15
Add one zero!
5 x 300 = 150!
She forgot one zero because 300 has two zeros!
What is 9 x 800?
7,200
7 x 89 = ?
623
What property does this show AND what is the answer?
5 x 12 = 12 x 5
Commutative property!
60
SHOW ME THE AREA MODEL FOR THIS AND THE ANSWER!
5 x 74 = ?
(area model)
= 370
Ms. Macke tried to solve this equation : 8 x 42
What is wrong with what Ms. Macke did?
8 x 4 = 32
8 x 2 = 16
8 x 42 = 336
She did 8 x 4 instead of 8 x 40!
YOU NEED TO GET BOTH CORRECT:
5 x 100 =
12 x 10 =
5 x 100 = 500
12 x 10 =120
What is the factor that makes this answer correct?
(6 x ___) + (6 x 4) = 204
30! Because....
(6 x 30) + (6 x 4) = 180 + 24 = 204
6 x 34 = 204