Building on previous experiences, students deepen their understanding of place value and expand their ability to add multidigit numbers. Students make connections between base-ten epresentations and paper-and-pencil methods. They also further develop their mental math strategies. Students collect these varied strategies into a menu to help them compare and start choosing appropriate methods to solve problems efficiently and accurately.

EXPECTATIONS
E1*	Use and apply place value concepts to make connections among representations of numbers to the thousands using base-ten pieces, number lines, expanded form, and standard form.
E2*	Represent and solve addition problems using base-ten pieces and number lines.
E3*	Add multidigit numbers using mental math strategies (e.g., composing and decomposing numbers and counting on).
E4*	Add multidigit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, and compact).
E5	Estimate sums using mental math strategies (e.g., rounding using benchmarks, using convenient numbers, composing and decomposing numbers, counting on).
E6*	Use mental math strategies to subtract for the facts in all groups.
E7*	Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in all groups.
E8	Use fact strategies, drawings, and number sentences to solve word problems involving multiplication facts for the 9s.
	* Denotes Benchmark Expectation