 ## Grade 1 Math: Counting Numbers 11-20

### Read and Write Numbers 11-20

In this lesson, students learn to read and write numbers from eleven through twenty. The numbers are represented using ten frames.

Students are given the numbers eleven through twenty in one format and they write the number given in another format. Three formats are used:

1. they are given the number in words and they write the number,
2. they are given the number and they select the word for that number, and
3. they are given a number in auditory format and they write it as a number.

### Rational Counting 11-20

In this lesson, students learn how to count objects in a set that have from eleven through twenty objects. They are taught that to count, they must keep track of the objects counted. They do that in this lesson by clicking on each object which transfers the object to a ten frame. When all objects have been transferred, they then write the number that indicates how many objects were counted.

### Counting: Missing Number 11-20

Students learn to fill in the missing number in the counting sequence from eleven through twenty. They are given a sequence of three numbers with one of the numbers missing, either the first, second, or third number. They enter the missing number.

### Counting 11-20

Students learn to fill in the missing number in the counting sequence from eleven through twenty. They are given a sequence of three numbers with one of the numbers missing, either the first, second, or third number. They enter the missing number.

### Counting as Addition

In this lesson, students begin to learn about place value and how it is used in both counting and addition. Numbers from eleven through twenty are represented as a group of ten and a number of ones, or, in the case of twenty, as two groups of ten.

They also learn that the numbers eleven through twenty can be represented as the addition of ten plus a single digit, or, in the case of twenty, as ten plus ten.

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