Lesson Plan

Developing Strategies for Addition and Subtracting Computation

Virtual manipulatives and Ipad apps for one-digit and two-digit addition and subtraction.
Stefanie K.
Classroom teacher
Tennessee Technological University based at RSCC-OR
Oak Ridge, United States
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My Grades K, 1, 2, 3, 4, 5, 6
My Subjects English Language Arts, Math, Science, Social Studies

Students will be able to use multiple methods to add and subtract using double digit numbers.

Grades 2
All Notes
Teacher Notes
Student Notes

1 iPad Apps

Mathboard- (The addition part of this app is free but to add subtraction, multiplication, division, etc. you must buy the full version.) This is an interactive chalkboard that gives a student a problem and then they must solve it. They have a space below the problem to work it out or an optional pull-out chart to help them solve the problem.

Arithmetic- This app can be used for addition and subtraction. Children must drag the fish to the correct answer and you questions get harder as you get more correct.

Math Zombies- Students use knowledge of math facts to answer problems to defend themselves against math zombies. The app can be set to different difficulty levels when you purchase the full version based on student progress.

2 Virtual Manipulatives




This website lists all the skills needed for second graders. Each practice gives you a preview of the problems before you select it. This is a great way for students to practice subtraction facts in many different forms. Ex- Subtracting 10. 80-60=__. 91-9=__.


Base Blocks Addition http://nlvm.usu.edu/en/nav/frames_asid_154_g_2_t_1.html

Base Blocks Subtraction http://nlvm.usu.edu/en/nav/frames_asid_155_g_2_t_1.html

“These two similar applets use base-ten blocks on a place-value chart. You can form any problem you wish up to four digits. The subtraction model shows the bottom number in red instead of blue. When the top blocks are dragged onto the red blocks, they disappear. Although you can begin in any column, the model forces a regrouping strategy as well as a take-away model for subtraction. Good for reinforcing the standard algorithms.”

(Page 26-27 in Math book)


Two-digit Addition and Subtraction


This website provides games that allow students to practice addition and subtraction using two-digit numbers. The game can be set to different levels to help ease them into the practice. It also encourages students to think on their feet and become more skilled with using two-digit numbers.