- About the Initiative
- View Topical Index of Curriculum Units
- Search Curricular Resources
- View Volumes of Curriculum Units from National Seminars
- Find Curriculum Units Written in Seminars Led by Yale Faculty
- Find Curriculum Units Written by Teachers in National Seminars
- Browse Curriculum Units Developed in Teachers Institutes
- On Common Ground
- League of Institutes
- Video Programs
Have a suggestion to improve this page?
To leave a general comment about our Web site, please click here
For many second graders, the beginning of the year is a time for revisiting knowledge and skills learned in first grade. The summer months away from mathematics instruction along with little opportunity for practice and guidance sometimes means a loss of strong understanding of concepts. Addition and subtraction of numbers to 100 is a Common Core Standard for first-grade students, although many struggle with this fundamental concept even throughout second grade. This curriculum unit is designed to increase students' understanding of the number line as a tool to help them master two-digit addition and subtraction, improve their base-ten number sense and increase their fluency in mathematical operations.
(Developed for Mathematics, grade 2; recommended for Mathematics, grade 3)
Sixteenth Intensive Session
July 6-17, 2020
Public School Teachers Named Yale National Fellows
View New Topical Index of Curriculum Units.
Search Curricular Resources written by teachers in National Seminars and Local Teachers Institute seminars.
View the Photo Gallery of Participants at Yale.
Explore the archive of News and Feature Stories.