# Count by tens to 120

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## Objective

SWBAT count by tens from any number to extend a counting sequence up to 120.

#### Big Idea

How can I count to 120? Let me count the ways. . . In this lesson students will learn to count by tens to 120 starting at any number.

## Activating Strategy

10 minutes
I like to start this lesson by watching the following video:

While we are counting, I point to the numbers on the hundreds chart.  I like to then give each student their own hundreds chart and have them color in the numbers as we count by tens to 100.  This provides them with a concrete picture of counting by tens to 100.  (I have provided a hundreds chart in the resources section.)

I guide the discussion by asking the following questions:

• What number did you color first? (10)
• What number did you color second? (20)
• How did you know what numbers to color? (I counted by tens and colored the numbers that I said.)
• Describe the pattern.  (It is a whole column on the chart.)
• Look at the numbers that you colored.  How are they all alike? (They all end in zero)
• How are the numbers different? (The number in the tens place is different.)

## Teaching Strategies

15 minutes

I then hand out a counting chart (a chart from 1-120, also located in the resources section).  Using the counting chart, I start at 3 and count by tens.

3, 13, 23, 33, 43, 53, 63, 73, 83, 93, 103, 113

I have students color and say the numbers as we are counting.  After we are done counting, ask the following questions:

• What pattern do you see in the colored numbers on the chart? (They go down the third column in the chart.)
• What pattern do you see in the numbers we colored? (There is a 3 in all the ones place and each number goes up by ten.)

Using the same strategy, and a different color, I then start at 7 and count by tens.

7, 17, 27, 37, 47, 57, 67, 77, 87, 97, 107, 117

I use the same questions as above to guide the discussion.  This is to get them thinking about the pattern in counting by tens.  All the numbers are in the same column, you just go down the column.

By discussing the patterns found in a hundred (or counting) chart, students begin to realize that there is a pattern and structure to our number system.  This is a direct correlation to MP7, looking for and making sense of structure and patterns.

## Independent Practice

30 minutes

I like to hand out a worksheet for the independent practice portion of this lesson.  The worksheet that I use for this lesson is designed to get the students to understand the patterns and structure of our number system.

For struggling students, I let them color or use highlighting tape for the numbers in the counting sequence to help them see the pattern.

## Closing/Summarizing

5 minutes

To close out the lesson, I use index cards and count by tens starting at 2 and have students put themselves in order at the front of the room.