Students explore numbers and use mental math and reasoning strategies to solve addition and subtraction problems. They are introduced to the 200 Chart and use it to identify, describe, and use patterns. Students will explore addition and subtraction using the 200 Chart, number lines and manipulatives and solve word problems involving two whole numbers with a sum within 100.

EXPECTATIONS
	Use this list of Expectations to assess students on the key concepts and skills in this unit.
E1*	Identify, describe, and use patterns on a 200 Chart and number line.
E2*	Connect representations of quantities using number lines, 200 Charts, and number sentences.
E3*	Represent addition and subtraction using multiple representations (e.g., stories, drawings, diagrams, counters, number sentences, number lines, 200 Chart).
E4	Recognize that the equal sign represents the relationship between two equal quantities.
E5	Solve subtraction problems using counting strategies.
E6	Use mental math strategies and reasoning strategies (e.g., using doubles, using ten, making ten, reasoning from known facts) to solve addition and subtraction problems within 20.
E7	Solve word problems (e.g., join, separate/take away, part-whole, compare) involving two whole numbers with a sum within 100 using counters, drawings, 200 Chart, and number lines.
E8	Draw a bar graph from a data table.
E9	Read a bar graph or table to find information about a data set.
E10*	Demonstrate fluency with the addition facts with sums to ten in Group D (3 + 3, 3 + 4, 4 + 4, 4 + 5).
E11*	Use math fact strategies to add (direct modeling, counting strategies, reasoning from known facts) for the facts in Group D (6 + 6, 6 + 7, 7 + 7, 7 + 8, 8 + 8, 10 + 9, 10 + 10).
E12*	Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group D.
	* Denotes Benchmark Expectation