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Intro to Counting in Groups (Arrays)
 Show lesson plan & teacher guide
 Show answers to discussion questions
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 We'll learn how to count in GROUPS.
 We will also learn that we can organize things into equal rows to make them easier to count.
 And we’ll explore how this knowledge can help us count how many tennis balls, juice boxes and cupcakes we have!

Discussion Questions

Before VideoHow can you skip count by 5s?ANSWER

Each number is 5 more than the number before it. 5, 10, 15, 20, 25, etc.

Each number is 10 more than the number before it. 10, 20, 30, 40, etc.

When you skip count by 5s, you add 5 each time.

I add the first two together. Then I add the last number to the sum.

12


After VideoWhat is repeated addition?ANSWER

Repeated addition is adding the same number over and over again. For example, 3 + 3 + 3 + 3 is repeated addition.

A row is a group of objects in a line. Rows go left and right.

An array is a group of equal rows that are lined up.

There are 4 dots in each row. Add 4 + 4 + 4 = 12.

Add 5 + 5 = 10.



Vocabulary

Skip counting
DEFINE
Counting on by amounts greater than 1.

Equal Groups
DEFINE
Groups with the same number of items.

Addition
DEFINE
Putting parts together to find a new total.

Repeated addition
DEFINE
Adding equal groups repeatedly, which means adding the same number again and again.

Row
DEFINE
A line of items. Rows go left and right.

Column
DEFINE
A line of items. Columns go up and down.

Array
DEFINE
Items lined up in equal rows.

Skip counting
DEFINE

Reading Material
Download as PDF Download PDF View as Separate PageWHAT ARE ARRAYS?Arrays are a way to arrange objects into equal rows. Making arrays with objects makes them easier to count. You can skip count, or repeatedly add, to find how many objects are in an array.
To better understand counting in groups (arrays)…
WHAT ARE ARRAYS?. Arrays are a way to arrange objects into equal rows. Making arrays with objects makes them easier to count. You can skip count, or repeatedly add, to find how many objects are in an array. To better understand counting in groups (arrays)…LET’S BREAK IT DOWN!
Line up tennis balls in an array.
You have 4 packs of 3 tennis balls. Line up the equal groups. Each group is called a row. Rows go left and right. When you line up equal rows, the whole thing is called an array.
Line up tennis balls in an array. You have 4 packs of 3 tennis balls. Line up the equal groups. Each group is called a row. Rows go left and right. When you line up equal rows, the whole thing is called an array.Count googly eyes in groups of 2.
You have some googly eyes. Arrange the googly eyes into an array. There are 4 rows with 2 eyes in each row. Count by 2s: 2, 4, 6, 8 eyes. This is the same as 2 + 2 + 2 + 2. Adding equal groups repeatedly is called repeated addition.
Count googly eyes in groups of 2. You have some googly eyes. Arrange the googly eyes into an array. There are 4 rows with 2 eyes in each row. Count by 2s: 2, 4, 6, 8 eyes. This is the same as 2 + 2 + 2 + 2. Adding equal groups repeatedly is called repeated addition.Count tennis balls in groups of 3.
Count the tennis balls in the array. There are 4 rows. Each row has 3 balls. Count by 3s four times: 3, 6, 9, 12. There are 12 tennis balls. 3 + 3 + 3 + 3 = 12.
Count tennis balls in groups of 3. Count the tennis balls in the array. There are 4 rows. Each row has 3 balls. Count by 3s four times: 3, 6, 9, 12. There are 12 tennis balls. 3 + 3 + 3 + 3 = 12.Count juice boxes in groups of 5.
You have 4 packs of 5 juice boxes. Line up the juice boxes in 4 equal rows of 5. This is an array. Count by 5s: 5, 10, 15, 20. There are 20 juice boxes. 5 + 5 + 5 + 5 = 20.
Count juice boxes in groups of 5. You have 4 packs of 5 juice boxes. Line up the juice boxes in 4 equal rows of 5. This is an array. Count by 5s: 5, 10, 15, 20. There are 20 juice boxes. 5 + 5 + 5 + 5 = 20.Count cupcakes in groups of 5.
You have a box of cupcakes. The cupcakes are in an array. There are 5 rows, and each row has 5 cupcakes. Count by 5s to count them all: 5, 10, 15, 20, 25. You can show this as repeated addition: 5 + 5 + 5 + 5 + 5 = 25.
Count cupcakes in groups of 5. You have a box of cupcakes. The cupcakes are in an array. There are 5 rows, and each row has 5 cupcakes. Count by 5s to count them all: 5, 10, 15, 20, 25. You can show this as repeated addition: 5 + 5 + 5 + 5 + 5 = 25. 
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Practice Number Problems

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Science & Math$_{/yr}

Science Only$_{/yr}
[Draw an array with 3 rows of 2 dots each on the board.] How many dots are in each row?
Count by 2s to find how many dots there are in all.
Write an addition equation using repeated addition to show how many dots there are.
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