This lesson builds on students' prior knowledge of combinations of ten. Students will add within 20 by decomposing to make 10. The task challenges students to add by decomposed and recombined to make a ten as an addition strategy. The big idea focuses on finding solutions multiple ways and decomposing and recombining numbers as strategies to add.
Vocabulary: tens, ones, decompose, recompose, digit, sum, equal, combination, ten frame
Special Materials:
Crayons
Connecting Cubes (optional)
Lesson plan