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StarfallTM presents second grade math activities that focus on place value, strategies for addition and subtraction, number lines, equal groups of objects as a foundation for multiplication, and real-world applications that will help students understand word problems. Common Core State Standards in Mathematics: 2.NBT.A.1, 2.NBT.A.3 (place value and base ten), 2.NBT.B.7, 2.NBT.B.8 (properties of operations to add and subtract), 1.OA.C.6 (add and subtract within 20), 2.OA.B.2, 2.OA.C.3 (odd or even groups of objects up to 20), 2.OA.C.4, 2.MD.B.6 (relate addition and subtraction to length), 3.OA.A.1, 3.OA.B.5, 3.OA.C.7 (multiplication). (责任编辑：) |