Students invent and explore strategies for solving the addition facts that have sums between 11 and 20. Students learn how to visualize and learn the doubles and near doubles facts. Students also learn how to break apart the addends to make ten. These strategies help students develop fluency with the math facts with sums larger than 10.

EXPECTATIONS
	Use this list of expectations to assess students on the key concepts and skills in this unit.
E1	Represent doubles, near doubles, and halves using counters, pictures, and number sentences.
E2	Represent addition and subtraction using stories, drawings, diagrams, counters, number sentences, number lines, or ten frames.
E3	Solve word problems (e.g., join, separate/take away, part-whole, compare) involving two whole numbers whose sum is between 10 and 20.
E4	Recognize that the equal sign represents the relationship between two equal quantities.
E5*	Use mental math strategies and reasoning strategies (e.g., using doubles, using ten, making ten) to solve addition problems with sums between 10 and 20 and the related subtraction problems.
E6*	Use strategies that apply the proper ties of addition (e.g., turn-around, compose and decompose numbers) to solve addition and subtraction problems.
E7*	Find the unknown whole number in an addition or subtraction equation relating three whole numbers.
E8*	Demonstrate fluency with the addition facts in Group A (0 + 1, 1 + 1, 2 + 1, 3 + 1, 0 + 2, 2 + 2, 3 + 2, 4 + 2).
E9*	Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group A.
	* Denotes Benchmark Expectation