## Common Core State Standards for Mathematics

Grade(s) 1 resources related to the following standard:
Operations and Algebraic Thinking
5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

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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 interactive Flash applet helps children understand the "take away" model of subtraction. Users choose starting numbers from within 10 or 20. A group of rabbits appears and the user is asked how many will remain if a certain number run away. Mousing over a clue button dims the number of runaways. After selecting the correct remainder, the rabbits run away, and the applet displays the number model and the word sentence that represent the problem. [Available for iPad & iPhone in the iTunes AppStore.]
Activity, Interactive Media
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 free iOS app provides activities for young children to develop skills in writing numerals, counting, addition, ordering, patterns, parity, algebraic thinking, and problem solving.
Activity, Interactive Media, Mobile App
Students can use this interactive applet to practice quick recognition of the number or value of a small group of objects, without one-to-one counting. This skill, called subitizing, is important in the development of number sense. The user chooses among several representations, including fingers, a pair of dice, an abacus, a ten frame, and coins. In this version of the game an adjustable timer determines how long each group is visible. The applet keeps score of the number correct in each round of ten attempts.
Activity, Game, Interactive Media
Students can use this interactive applet to practice quick recognition of the number or value of a small group of objects, without one-to-one counting. This skill, called subitizing, is important in the development of number sense. The user chooses among several representations, including fingers, a pair of dice, an abacus, a ten frame, and coins. In this version of the game users score points according to how quickly and accurately they complete each round of ten examples.
Activity, Game, Interactive Media
The characters in this free iOS app model effective strategies for learning addition facts (counting, counting on, near doubles, tens). During the tool round children develop conceptual understanding as they practice using these strategies. The speed round develops fact fluency and encourages memorization, providing hints as needed. Controls allow teachers to setup a class and adjust difficulty settings.
Interactive Media, Mobile App