Numbers 11 to 19 - math grade 2 - lesson 25

1.TEACHER SAY: Today we are going to begin with an activity called Shake It Share It High Five. First, you will move around the room and find a partner. Second, once you have found a partner, you will shake their hand. Third, I will ask a question. Fourth, you will share your thinking with your partner, and fifth, you will give them a high five. Then everyone will find a new partner and do it again. Let’s give it a try. Go ahead and find a partner. You have 30 seconds.

STUDENTS DO: Find a partner for Shake It Share It High Five and shake hands.

TEACHER SAY: My first question is: What is one way we can write numbers?

STUDENTS DO: Share their answer with their partner.

TEACHER DO: Allow time for students to share.

TEACHER SAY: Now give them a high five, find a new partner, and shake your new partner’s hand.

STUDENTS DO: High Five their partner. Then find a new partner and shake their new partner’s hand.

TEACHER SAY: Next question: I will write a number in expanded form on the board. Work with your new partner to come up with the standard form for the number I write. I will call on one pair to write their answer on the board.

TEACHER DO: Write 900 + 90 + 9 on the board. Allow time for students to solve.

STUDENTS DO: Share their answer with their partner.

TEACHER DO: Call on one pair to write the number on the board.

TEACHER SAY: Great job. You may go back to your desk now.

STUDENTS DO: Go back to their desks.

TEACHER SAY: Now we are going to practice what we learned yesterday—writing numbers in word form. Yesterday we filled in a chart in our student books for some numbers. Today I am going to write a number in word form on the board. You will copy the word form and then write the standard form of the number. Open your student book to page Lesson 25: Apply.

STUDENTS DO: Open student book to page Lesson 25: Apply.

TEACHER DO: Write on the board: ten.

TEACHER SAY: For example, I wrote ten in word form on the board. First, you will copy what I wrote into your student book. Then you will write the standard form of ten. You can see that it is done for you in your book. Ready? Let’s begin.

TEACHER DO: Write on the board: seven. Read the number aloud.

TEACHER SAY: Copy what I wrote. Then write the standard form of seven.

STUDENTS DO: Write seven and 7 in the student book.

TEACHER DO: Write the answer on the board so students can self-check their work. Repeat the process with four more numbers.

2.TEACHER SAY: Th e next numbers I will write are numbers that we did not put in our chart yesterday. You do not need to know how to write these numbers in word form, but you do need to be able to read them and write the standard form of the number.

TEACHER DO: Write on the board: eleven.

TEACHER SAY: Th is is the word form for the number 11. Write 11 in your student book.

STUDENTS DO: Write 11 in the student books.

TEACHER DO: Continue with numbers 12 to 19.

STUDENTS DO: Write the standard form of the numbers given in word form. Check answers and correct them if necessary.