OA Task 9c Operations and Algebraic Thinking Domain Represent and solve problems involving addition and subtraction. Cluster Add and subtract within 20. Standard(s) 1.OA.1 Use 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. 1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Compare/Smaller Unknown- Version with “fewer” Materials SF, Cubes or counters, pencil Task Provide materials to the student. Read the problem to the student: Samuel has 5 fewer coins than Diego. Diego has 17 coins. How many coins does Samuel have? Write a number sentence that matches this story. Use a symbol for the unknown number. Once an equation is written, say: Solve the problem and show your thinking with pictures, numbers, or words. Continuum of Understanding Incorrectly solves the problem with an answer other Strategy(ies) Used: Developing Understanding than 12. and Error Relies on all” as primary strategy for Counting All “counting solving problem. Counting On Equation is inaccurate. Tens Explanation is lacking in detail or non-existent. Basic Facts Think Addition Complete Correctly solves the problem: 12 Creates easier or known Understanding Successfully uses strategies such as facts, and/or the relationship between addition and sums Doubles subtraction Explanation is clear. Doubles +/- 1, 2 Other: Equation is accurate (e.g., 17 - 5 = *; 17 = * + 5). Standards for Mathematical Practice 1. Makes sense and perseveres in solving problems. 2. Reasons abstractly and quantitatively. 3. Constructs viable arguments and critiques the reasoning of others. 4. Models with mathematics. 5. Uses appropriate tools strategically. 6. Attends to precision. 7. Looks for and makes use of structure. 8. for and expresses regularity in repeated reasoning.
OA Task 9c Domain Operations and Algebraic Thinking Cluster Represent and solve problems involving addition and subtraction. Add and subtract within 20. Standard(s) 1.OA.1 Use 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. 1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Compare/Smaller Unknown- Version with “fewer” Materials SF, Cubes or counters, pencil Task Provide materials to the student. Read the problem to the student: Samuel has 5 fewer coins than Diego. Diego has 17 coins. How many coins does Samuel have? Write a number sentence that matches this story. Use a symbol for the unknown number. Once an equation is written, say: Solve the problem and show your thinking with pictures, numbers, or words. Continuum of Understanding Developing Understanding Incorrectly solves the problem with an answer other than 12. Relies on “counting all” as primary strategy for solving problem. Equation is inaccurate. Explanation is lacking in detail or non-existent. Strategy(ies) Used: and Error Counting All Counting On Tens Basic Facts Think Addition Creates easier or known sums Doubles Doubles +/- 1, 2 Other: Complete Understanding Correctly solves the problem: 12 Successfully uses strategies such as facts, and/or the relationship between addition and subtraction Explanation is clear. Equation is accurate (e.g., 17 - 5 = *; 17 = * + 5). Standards for Mathematical Practice 1. Makes sense and perseveres in solving problems. 2. Reasons abstractly and quantitatively. 3. Constructs viable arguments and critiques the reasoning of others. 4. Models with mathematics. 5. Uses appropriate tools strategically. 6. Attends to precision. 7. Looks for and makes use of structure. 8. for and expresses regularity in repeated reasoning.