## Common Core State Standards for Mathematics

Grade(s) K resources related to the following standard:
Operations and Algebraic Thinking
Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
1. Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.

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This professional development video clip shows students engaged in the Common Core Practice Standard #4-Model with mathematics. In this video clip a teacher uses dominos to help students explore properties of addition. Additional resources include a video transcript and teaching tips. A related clip (cataloged separately) shows the same exploration by the same students but Common Core Practice Standard # #5-Use appropriate tools strategically is evident.
Instructional Strategy, Video
This problem provides an opportunity for students to practice counting and to represent and record findings in different ways: "Noah saw 12 legs walk by into the Ark. How many creatures did he see?" Multiple solution possibilities encourage students to be systematic in their strategies. The Teachers' Notes page offers suggestions for implementation, discussion questions, and an idea for extension.
Activity
Grade Level: K, 1, 2, 3
This applet demonstrates operations with whole numbers on a number line. The student selects an operation and the applet represents an example. It helps students understand the commutativity of multiplication, remainders in division, inverse operations, and the relationships between operations.
Activity, Interactive Media
Grade Level: K, 1, 2, 3
This activity helps children become more familiar with horizontal and vertical number lines (0 through 10) and how to use them for addition. It can be used to introduce subtraction as the inverse of addition and the use of an unknown number. The Teachers' Notes page offers rationale, suggestions for implementation, discussion questions, ideas for extension and support, printable number lines (pdf), and a link to a related game, Incey Wincey Spider (catalogued separately).
Activity
This Java applet allows children to explore a balancing tool and thus build their algebraic thinking about equivalency. By placing shapes on each side of the balance and finding equivalent sets of weights, students discover the weight of each shape in one of six built-in sets or a random set.
Activity, Interactive Media
In this 2-minute video teacher Jen Saul describes and models a technique for helping students develop number sense and mental math skills and learn complements of 10. As prompted by the teachers, students repeatedly form groups of 0-10 from 10 popsicle sticks. Viewer reflection questions are provided.
Activity, Instructional Strategy, Video
Resource is part of a PD collection
In this lesson, students will play the roles of banker and consumers as they learn how to use different combinations of coins to make money amounts up to 25 cents. Students will earn money and save it in their piggy banks until they have the exact amount to purchase an item of their choice. Suggestions for questions and assessment options are included.
Lesson Plans
Grade Level: Pre-K, K, 1, 2
This packet of information for teachers is designed to be used with the How Many Berries Did I Eat? Problem of the Week from the Math Forum collection for grades K to 2. The sample problem provides an exemplar of the type of problem teachers can use to promote students' mathematical thinking and reasoning and engage their interest. The key concept addressed in this problem is subtraction. The packet contains the sample problem, alignment to the Common Core State Standards, possible solutions, teaching suggestions, a print-ready copy of the problem, and a problem-specific scoring rubric.
Assessment, Activity, Instructional Strategy, Instructor Guide/Manual, Reference Materials
This is a collection of simple interactive activities to help young children practice early number skills. They use visual representations to develop counting and subitizing skills, number sense, place value concepts, and basic whole number operations (addition, subtraction, doubling). A teacher page summarizes the purpose and functions of each activity.
Activity, Interactive Media
Grade Level: Pre-K, K, 1, 2
This interactive Flash applet provides a virtual environment in which students can explore the concept of weight/mass. They place virtual teddy bears on a pan scale to determine their weights. The bears weigh from 1 to 4 units and can be placed on the scale individually or in groups. The activity lends itself to mental addition and subtraction with values less than or equal to ten.
Activity, Interactive Media