Multiplication Review

FACTORS & Multiples

100

What are the factors in the multiplication problem show below? 5 x 9 = 45

5 and 9 are factors. (The numbers that are being multiplied together are the factors.)

200

List the first 5 multiples of the number 4.

The first 5 multiples are 4, 8, 12, 16, and 20.

300

What is the missing factor in this problem? 3 x ___ = 15

The missing factor is 5. 3 x 5 = 15

400

Is the number 25 a multiple of 2? How do you know?

NO! Multiples of 2 are all even numbers. ex: 2, 4, 6, 8, 10, 12....

500

What is the missing factor? (2 x 3) x 4 = 2 x (__ x 4)

The missing factor is 3.

ARRAYS & EQUAL GROUPS

100

What multiplication fact matches the array shown below? x x x x x x x x x x x x x x x x x x x x x x x x

6 x 4

200

What multiplication fact is represented by the equal groups shown below? X X X X X X X X X X XX

4 X 3

300

Michael has 3 dogs. To show how many paws they have in all, what will your equal groups look like? How many groups? How many in each group?

You can draw 3 groups of 4 or 4 groups of 3.

400

Which array shows 2 x 7 = 14 A.) x x x x x x x x x x x x x x or B.) x x x x x x x x x x x x x x

Choice A shows an array to represent 2 x 7 = 14. (Choice B has 14 x's but they are not in even rows and columns.)

500

Which array matches the equal groups drawn here? x x x x x x x x x x x x x x x x x x x x A.) x x x x x x x x x x x x x x x x x x x x or B.) x x x x x x x x x x x x x x x x x x x x

Both A AND B represent the equal groups. 4 rows of 5 AND 5 rows of 4 are both acceptable ways to draw this array.

REPEATED ADDITION/BASIC FACTS

100

How can you solve 8 x 6 with repeated addition?

8 + 8 + 8 + 8 + 8 + 8= 48 or 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 = 48

200

What multiplication problem will help you solve this repeated addition problem? 2 + 2 + 2 + 2 + 2 

2 x 5 = 10

300

What is 5 x 6?

30

400

What is 3 x 8?

24

500

What is 9 x 4?

36

Draw it

100

7x3=

division/addition

What is 21

Draw 3 objects with 7 items in it.

Write multiplication backwards 

Write 3 down 7 times 

  

  

200

 9 x 1

division/addition

What is 9

Draw 1 objects with 9 items in it.

Write multiplication backwards 

Write 1 down 9 times 

300

 6 x 2

division/addition

What is 12

Draw 2 objects with 6 items in it.

Write multiplication backwards 

Write 2 down 6 times 

  

  

400

 4 x 9 =

division/addition

What is 36

Draw 4 objects with 9 items in it.

Write multiplication backwards 

Write 4 down 9 times 

  

  

500

6 x 8

division/addition

what is 48

Draw 6 objects with 8 items inside 

Write multiplication backwards 

Write 6 down 8 times 

 

WORD PROBLEMS

100

There are 4 bags of oranges on the table. Each bag has 2 oranges in it? How many oranges are there altogether?

There are 8 oranges altogether.

200

Sarah has 5 friends. She gives each friend 3 stickers. How many stickers is she giving to her friends in all?

She is giving out 15 stickers.

300

Four monkeys ate some bananas for a snack. Each monkey had six bananas. What is the total number of bananas that they ate?

They had 24 bananas total.

400

There are four groups of desks in our classroom. Five desks are at each group. How many students can sit at a desk in our classroom?

There are enough desks for 20 students.

500

CHALLENGE!!!!! There are 7 third grade classes. Each class has about 20 students in it. Approximately how many students are there in third grade at Welch Elementary?

There are about 140 students.