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# Winter NO PREP Addition and Subtraction Strategies CCSS OA1-8 Standards

Common Core Standards
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Winter Addition and Subtraction Math Packet for Common Core OA1-8 Standards

This packet contains 20 activities and a parent letter to send home that states the following information:

First Grade Unit 5 Math Standards
Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.
MCC1.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.
MCC1.OA.2 Solve 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.

Understand and apply properties of operations and the relationship between addition and subtraction.
MCC1.OA.3 Apply properties of operations as strategies to add and subtract.3
Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (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. (Associative property of addition.)
MCC1.OA.4 Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that make 10 when added to 8.

Add and subtract within 20
MCC1.OA.5 Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
MCC1.OA.6. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. 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).

Work with addition and subtraction equations
MCC1.OA.7 Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 +1 = 5 + 2.
MCC1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ?= 11, 5= □ – 3, 6 + 6 = ∆.

Represent and interpret data.
MCC1.MD.4 Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many in each category, and how many more or less are in one category than in another.

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23 pages
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