Learning Coach —

Objectives

Students will:

Skills Needed

Students must be able to:

Materials Needed

Students will need:

Keywords

Learning Coach Notes

Let’s Learn!

What is an array?

Think About It!

Goal: Learn about how arrays help us multiply.

How many groups times how many in each group

We can use an array to help us multiply. An array puts items in rows and columns. Then, we can see the groups and how many are in each group! Each row needs to have the same number of items. We can also use repeated addition to help us find the answer. That means we will have the same number as a repeated addend!

Let’s put our ducks in an array! We want the same number in each row.

4 rows of 3 ducks

Look at the ducks. How many rows do you think we need? How many will be in each row? Click $mock yellow show-me button$ to see if you are right!

We need an array that has 4 rows with 3 ducks in each. Click to see the ducks appear!

We need to know the number of groups and the number of ducks in each group. The number of rows is the number of groups. The number of ducks in each row is the number in each group.

We need a repeated addition sentence. The number of rows is the number of addends. The number in each row is the repeated addend.

Question 1:

How many groups of ducks are there?

4 rows of ducks with 3 ducks in each row

Question 2:

How many ducks are in each group?

4 rows of ducks with 3 ducks in each row

There are 4 groups of ducks. There are 3 ducks in each group.

4 rows of 3 ducks

____ X ____ = ?

What multiplication sentence has 4 groups with 3 in each? Click $mock yellow show-me button$ to see if you are right!

We want to find the answer to 4 x 3. We can use repeated addition to help us!

4 rows of ducks with 3 ducks in each row

4 X 3 = ?

____ + ____ + ____ + ____ = ?

The repeated addend will be the number in each group. There should be 4 addends because there are 4 groups!

Question:

What repeated addition sentence will help us solve 4 x 3?

4 rows of ducks with 3 ducks in each row explaining 3 plus 3 plus 3 plus 3 equals 12

How do we find the answer? We can look at the array to help us.

4 rows of ducks with 3 ducks in each row explaining 4 times 3 equals 12

4 x 3 = ?

3 + 3 + 3 + 3 = ?

Question 1:

How many are in the first 2 groups?

Question 2:

Now, add on another group. How many are in the first three groups?

Question 3:

Let’s add the last group.

We can use arrays to help us multiply. Then, we can use repeated addition to find the answer!