Number Line
Show 5 X 30 on a number line
5 jumps of 30
5 X 30 = 150
Make a sketch of 5 X 30
5 rows of 3 tens in each row
5 X 30 = 150
Use the Distributive Property.
4 × 20 = 4 × (10 + _____)
4 × 20 = (4 × 10) + (4 × _____)
4 × 20 = _____ + _____
4 × 20 = _____
4 × 20 = 4 × (10 + 10)
= (4 × 10) + (4 × 10) =
40 + 40 =
80
Newton saves $6 each week for 5 weeks. He spends all of the money on 3 books that each cost the same amount. How much does each book cost?
6 x 5 = $30
$30 ÷ 3 = $10 a book
A concert hall has 4 rows of seats. Each row has 40 seats. Can the concert hall seat 200 people? Explain.
No because 4 x 40 = 160 and 160 < 200
Show 4 X 50 on a number line
4 jumps of 50
4 X 50 = 200
Make a sketch of 4 x 60
4 rows of 6 tens in each row
4 X 60 =240
Use the Associative Property
3 × 60 = 3 × (_____ × 10)
3 × 60 = (3 × _____) × 10
3 × 60 = _____ × 10
3 × 60 = _____
3 × 60 = 3 × (6 × 10)
= (3 × 6) × 10
= 18 × 10
= 180
There are 2 boxes. Each box has 4 packages. Each package has 6 rice crackers. How many rice crackers are there in all?
6 x 4 = 24
24 x 2 = 48
48 rice crackers
A group of instructors pack coolers for a summer camp. Each cooler has 35 apples and 15 oranges. How many pieces of fruit are in 6 coolers?
35 + 15 = 50 fruits
50 x 6 = 300 fruits
6 jumps of 40
6 X 40 = 240
Make a sketch of 9 x 40
9 rows of 4 tens in each row
9 x 40= 360
Use the Associative Property
6 × 50 = 6 × (__ × 10)
6 × 50 = (6 × __) × 10
6 × 50 = __ X 10
6 x 50 =
5
5
30
300
Descartes saves $4 each week for 4 weeks. He spends all of the money on 8 hockey cards that each cost the same amount. How much does each hockey card cost?
$4 x 4 = $16
$16 ÷ 8 = $2
$2
There are 5 teams in a hockey tournament. Each team has 10 players. Each player scores 2 goals. How many goals are scored in all?
10 x 2 = 20
20 x 5 = 100 goals
Show 9 X 70 on a number line
9 X 70 = 630
3 × 80 = 3 × _____ tens
3 × 80 = _____ tens
3 × 80 = _____
8 tens
24 tens
240
Use the Distributive Property
9 × 20 = 9 × (10 + _____)
9 × 20 = (9 × 10) + (9 × _____)
9 × 20 = _____ + _____
9 × 20 = _____
9 × 20 = 9 × (10 + 10)
= (9 × 10) + (9 × 10) =
90 + 90 =
180
Newton buys 10 sheets of stamps. Each sheet has 2 rows with 2 stamps in each row. He divides the stamps equally into 5 envelopes. How many stamps are in each envelope?
10 x 4 = 40
40 ÷ 5 = 8
8 stamps
Find 6 × 50. How many hundreds are in the product? How many tens? ____ hundreds ____ tens
6 x 50 = 300
3 hundreds
30 tens
Show 7 X 80 on a number line
7 jumps of 80
7 X 80 = 560
8 × 60 = 8 × _____ tens
8 × 60 = _____ tens
8 × 60 = _____
6 tens
48 tens
480
Use the Distributive Property.
7 × 20 = 7× (10 + _____)
7 × 20 = (7 × 10) + (7 × _____)
7 × 20 = _____ + _____
7 × 20 = _____
7 × 20 = 7 × (10 + 10)
= (7 × 10) + (7 × 10) =
70 + 70 =
140
Six classrooms have 3 boxes of textbooks to share equally. Each box has 20 textbooks. How many textbooks does each classroom get?
3 x 20 = 60
60 ÷ 6 = 10
10 textbooks
Find the number that makes ____ × 4 – 12 = 8 true. Explain.
5
5 × 4 – 12 = 20 – 12 = 8