Examples: If 8 3 = 11 is known, then 3 8 = 11 is also known. A.2Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. Use strategies such as counting on; making ten (e.g., 8 6 = 8 2 4 = 10 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 7 by creating the known equivalent 6 6 1 = 12 1 = 13). Hands-On Problem Solving for Grade 1 is divided into three sections: routine, non-routine, and extended explorations.
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A.1Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
(Commutative property of addition.) To add 2 6 4, the second two numbers can be added to make a ten, so 2 6 4 = 2 10 = 12. For more information, please send an e-mail to Cost: US.00/year(12 months)/user.With credit card or any electronic transaction US.00/year (12 months)/user. D.7Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, determine the unknown number that makes the equation true in each of the equations 8 ? High-Number Toss - 2 is designed to measure student understanding of place value as it is used in the Everyday Math Game of the same name.Name That Number - 1 is designed to measure student understanding of place value as it is used in the Everyday Math Game of the same name.For more information, please send an e-mail to , San Jose, California , USA All Rights Reserved.The math problems contained within this site can be copied for use by teachers from non-profit organizations with subscriptions within their classrooms.High-Number Toss - 1 is designed to measure student understanding of place value as it is used in the Everyday Math Game of the same name.  Students must be familiar with the game to successfully solve the problem.