Addition and subtraction 1

Students add two-digit numbers by decomposing them into tens and ones. They use base-ten blocks and drawings to model addition within 100.

2.NBT.B.5: Flexibly and efficiently add and subtract within 100 using strategies based on place value, properties of operations, an...

Students subtract two-digit numbers by decomposing into tens and ones. They use place value strategies and models to subtract within 100.

2.NBT.B.5: Flexibly and efficiently add and subtract within 100 using strategies based on place value, properties of operations, an...

Students add two-digit numbers that require regrouping ones as a ten. They connect the regrouping process to base-ten block models.

2.NBT.B.5: Flexibly and efficiently add and subtract within 100 using strategies based on place value, properties of operations, an...

Students subtract two-digit numbers that require decomposing a ten into ones. They use drawings and place value charts to show the regrouping process.

2.NBT.B.5: Flexibly and efficiently add and subtract within 100 using strategies based on place value, properties of operations, an...

Students solve one-step word problems involving addition within 100. They identify key information and choose an appropriate strategy to find the sum.

2.OA.A.1: Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taki...

Students solve one-step word problems involving subtraction within 100. They determine whether to add or subtract based on the problem context.

2.OA.A.1: Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taki...

Students solve two-step word problems using addition and subtraction within 100. They write equations with a symbol for the unknown and explain their solution steps.

2.OA.A.1: Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taki...

Students select and apply efficient strategies to solve one- and two-step word problems. They compare different approaches and explain which strategy works best.

2.OA.A.1: Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taki...

Students add three two-digit numbers using place value strategies. They look for pairs that make a ten to simplify the addition.

2.NBT.B.6: Add up to four two-digit numbers using strategies based on place value and properties of operations.

Students add up to four two-digit numbers using place value and properties of operations. They group addends strategically to make the computation easier.

2.NBT.B.6: Add up to four two-digit numbers using strategies based on place value and properties of operations.

Students apply the commutative and associative properties to add multiple two-digit numbers. They rearrange and group addends to create simpler partial sums.

2.NBT.B.6: Add up to four two-digit numbers using strategies based on place value and properties of operations.

Students solve real-world problems that require adding three or four two-digit numbers. They choose efficient strategies and explain their reasoning.

2.NBT.B.6: Add up to four two-digit numbers using strategies based on place value and properties of operations.