Vocabulary
Place value
Use the associative property: 3 x 40 =
= 3 x (4 x 10)
= (3 x 4) x 10
= 12 x 10
=120
Lynjia earns $30 for each bracelet she makes. How much does Lynjia earn for making 5 bracelets?
$150
5 x 30 = 150
2 x 30 =
60
9 x 10 =
90
A number that has a 0 in the ones place is a ________ of 10.
Multiple
Use the distributive property and break into multiples of 10: 4 x 40 =
= 4 x (10 + 10 + 10 + 10)
= (4 x 10)+(4 x 10)+(4 x 10)+(4 x 10)
= 40 + 40 + 40 + 40
= 160
Dy'Mere practices football 3 days each week. Each practice session lasts 40 minutes. How many minutes does Dy'Mere practice each week?
120 minutes
3 x 40 = 120
4 x 60 =
240
5 x 50 =
250
When you show that 6 x 30 is equal to 6 x (10 + 10+ 10), I am using __________ property.
Distributive property
Use the associative property: 6 x 70 =
= 6 x (7 x 10)
= (6 x 7) x 10
= 42 x 10
=420
Mekhi plays Fortnite for 60 minutes after school. How many minutes would Mekhi have played if he played Fortnite 4 days a week?
240 minutes
4 x 60 = 240
5 x 80 =
400
4 x 40 =
160
You can use place value to _______ multiples of 10 as hundreds and tens. Example = 5 x 30 = 15 tens = 1 hundred 5 tens
Regroup
Use the distributive property and break into multiples of 10: 3 x 50 =
= 3 x (10 + 10 + 10 + 10 + 10)
= (3 x 10)+(3 x 10)+(3 x 10)+(3 x 10)+(3 x 10)
= 30 + 30 + 30 + 30 + 30
= 150
Brooke attends cheerleading practice 2 days a week. Each cheerleading practice lasts 90 minutes. How many minutes does Brooke attend cheerleading practice each week?
180 minutes
2 x 90 = 180
7 x 40 =
280
2 x 90 =
180
This property states that when the grouping of the factors is changed, the product remains the same. Example: 2 x (3 x 4) = (2 x 3) x 4
Associate Property
Use the associative property: 3 x 90 =
= 3 x (9 x 10)
= (3 x 9) x 10
= 27 x 10
=270
The 3rd grade class learns math each school day of the week (Monday through Friday). They learn math for 40 minutes each day. How many minutes do they learn math in a week?
200 minutes
5 x 40 = 200
3 x 80 =
240
6 x 60 =
360