Curated OER
Number in Geometry
Learners use a number line to assist with their additions. They use a calculator to check for factors. Students are taught factors and multiples. They use array model of multiplication to define meaning. Learners develop a wide range of...
Khan Academy
Khan Academy: Subtract 1 or 10
Practice subtracting 1 or 10 from a 2-digit number (no regrouping). Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Other
Nearpod: Adding Within 100
In this instructional activity on addition within 100, students will learn how to compose numbers and will explore strategies to add double-digit numbers such as vertical addition, regrouping, using multiples of 10, and labeling an open...
Discovery Education
Discovery Education: Web Math: See What Place Value a Number Has
Here's an interactive problem solver allowing you to type in a multi-digit number and get answers to what place value each number represents.
ClassFlow
Class Flow: What Is the Sum Chicken Little?
[Free Registration/Login Required] This flipchart is intended for students to practice one-digit addition. It follows Chicken Little as he tries to learn to add. It is a fun flipchart for addition!