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### PRODUCT DESCRIPTION

224 Differentiated Addition Strategy Worksheets aligned specifically to the First Grade Common Core. Example problems with explanations and student directions included at the top of each worksheet to support student independence.

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SAVE BIG WHEN YOU BUNDLE!!
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3 Differentiated Levels: Level 1 worksheets include embedded student supports to help struggling mathematicians reach each learning target. Level 2 worksheets remove the extra student supports to allow students to complete the mathematical processes on their own. Level 3 worksheets offer challenge problems for proficient students.

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Concepts covered include:
Addition Strategies: Counting On, Making Ten, Using Doubles, etc.
Commutative & Associative Properties
Solving for the Whole
Ten More
Regrouping Once
Regrouping Twice

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Common Core Math Standards Covered:
CCSS.MATH.CONTENT.1.OA.A.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
CCSS.MATH.CONTENT.1.OA.A.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.
CCSS.MATH.CONTENT.1.OA.B.3
Apply properties of operations as strategies to add and subtract.2 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.)
CCSS.MATH.CONTENT.1.OA.C.5
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
CCSS.MATH.CONTENT.1.OA.C.6
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.
CCSS.MATH.CONTENT.1.OA.D.7
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.
CCSS.MATH.CONTENT.1.OA.D.8
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
CCSS.MATH.CONTENT.1.NBT.C.4
Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings.
CCSS.MATH.CONTENT.1.NBT.C.5
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

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