Multiplication strategies
Use the double double strategy to solve 4x4
4x4=8
8x2=16
Luis has 15 baseball cards. His brother has 3 times as many baseball cards as Luis. Write an equation showing how many baseball cards his brother has.
3 X 15=45
True or false
A prime number is a whole number that has more factors than 1 factor and itself.
False
____x8=80
8
Use the half ten plus one set strategy to solve 6x4.
Show your work
5x4=20
4x1=4
20+4=24
Clairesandra bought shoes and a jacket. The shoes cost $20.00. The jacket cost four times as much as the shoes. How much was the jacket?
Show your thinking.
The Jacket cost $80.00
Write a prime number between 1-30.
Write all of its factors.
How do you know this is a prime number?
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
2x1, 3x1, 5x1, 7x1, 11x1, 13x1, 17x1, 19x1, 23x1, 29x1
I know it a prime number because it is a whole number that only has factors of 1 and itself.
6x___=42
7
Use the half ten strategy to solve 5x8
Show your work
5x5=25
5x3=15
25+15=40
Lindsay saw 3 rows of crayons in her 24 pack of crayons. How many crayons are in each row?
There are 8 crayons in each row
24รท3=8
Write all the factors of the number 12.
How do you know this is a composite number?
1,2,3,4,6,12
I know it is a composite number because it is a whole number that has more that 2 factors.
8x9=?
Show your work.
72
Use the double double double strategy to solve 8x8
8x2=16
16x2=32
32x2=62
Ms. Wade bought a call of duty and an action figure. Call of duty cost $48.00. The action figure cost $12.00. How many more times was the game than the action figure?
Show your work
1 12
2 24
3 36
4 48
The game cost 4 times as much.
Write all the factors of 27
Is 27 prime or composite?
1,3,9,27
Composite
List 3 multiples of 12.
12,24,26,36,48,60,72
Use the ten minus one set strategy to solve 9x8
Show your work
10x8=80
8x1=8
80-8=72
The red table has 5 students. Each student brought 6 folders. The yellow table has 6 students. Each student brought 8 folders. How many folders do both groups have?
Show your work.
5x6=30
6x8=48
30+48=78
They have 78 folders al together.
Write all the factors of 100.
Is 100 prime or composite?
1, 2, 4, 5, 10, 20, 25, 50 and 100
Composite
16x17=?
Show your thinking
240