Introduce place value to your emerging mathematicians while focusing on the numbers 11–20. In this lesson, students will practice separating teen numbers into 10 ones and some additional ones using unifix cubes and ten frames.
Students will be able to separate teen numbers into 10 ones and some other ones, using objects, a ten frame and drawings.
The adjustment to the whole group lesson is a modification to differentiate for children who are English learners.
Gather students on the rug and display a number line.
Call their attention to the numbers 11–20, and tell the students that these are called the teen numbers.
Activate prior knowledge by asking students what they know about numbers 11–20. Ask if they know someone between 11 and 20 years old, or where they may have seen these numbers. Have students turn and talk to a partner, and then choose a few volunteers to share out with the class.
Tell the students that today they will work on building numbers between 11 and 20 with cubes.
Display written numbers 11–20 and practice counting them while pointing to each number.
Allow students to turn and talk to share what they know about teen numbers in their home language (L1).
Have students turn and talk to a partner to share what they know about teen numbers using the sentence starter, "I know that teen numbers ____________."