4th grade Review - 2.1 and 2.2 and 2.3

4th grade Review - 2.1 and 2.2 and 2.3

This week we have learned

• Multiplication comparisons (6 times as many as 3 is 18)

• How to solve word problems with comparisons

• How to multiply by the tens, hundreds and thousands

• Important multiplication vocabulary

Multiplication Comparisons

We can use multiplication to compare amounts.

Think of "is" as =

Think of "times as many" as x

42 is 6 times as many as 7

42= 6 x 7

MAKE SURE YOU KEEP THE NUMBERS IN THE RIGHT ORDER

Multiple Choice

Write this as a multiplication equation:
36 is 9 times as many as 4

• 36= 9 x 4
• 9 x 4= 36

Multiple Choice

Write this as a multiplication equation:
8 times as many as 6 is 48

• 8 x 6= 48
• 48= 8 x 6

Multiple Choice

What equation could match the following statement:
Seventy-two is eight times as many as nine.

• 72=8x9
• 8 x 72 =576
• 9 x 72 = 648
• 8 x 8= 64

How to solve word problems with multiplication comparisons

Multiple Choice

Julie has 3 times as many cats as Meredith.  Meredith has 6 cats.  How many cats does Julie have.
Which equation can be used to solve the problem?

• 3 x 6= 18
• 2 x 6= 12
• 4 x 6= 24

Multiple Choice

Robert has 8 friends. Shelly has 2 times as many friends. How many friends does Shellie have?

Which equation can be used to solve the problem?

• 8 x 2= 16

• 7 x 3= 21

• 7 x 4= 28

Multiple Choice

Natalie has 3 puppies. Katie has 5 times as many puppies. How many puppies does Katie have?

• 15

• 20

• 9

How to multiply by 10s, 100s, 1,000s,

Look at the first digit in both of the factors

Multiply both of those digits

Add the same number of zeros to the product that are in the factor

Multiple Choice

4 x 80

• 32

• 3,600

• 320

Multiple Choice

4 x 200 = ....

• 4,000

• 800

• 400

Multiple Choice

7 x 1,000 =

• 7

• 70

• 700

• 7,000

Important multiplication vocabulary

Factor= the numbers you multiply

Product= the answer

Multiple Choice

Is the missing number a factor or a product? 3 x 9 = ___

• factor

• product

Multiple Choice

4 x 10 = 40

The 4 and 10 are called the ______________.

• factors

• products