In this unit, students develop counting skills for numbers 11–20 and learn to show teen numbers as ten ones and some more ones. They deepen their understanding of addition and subtraction and develop fluency with 5. Students learn to tell and solve addition and subtraction story problems and write number sentences that represent the problems. Students also compose new shapes with two-dimensional shapes. They classify items according to attributes and compare the categories.

Unit 1 • Unit 2 • Unit 3
Unit 4 • Unit 5

There are five Family Letters for Unit 3. Currently available translations are linked below.