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Practice problem

Grade 2 · 2.NBT.B.5

Explain an addition strategy

Individual task

Practice problem

Grade 2 · 2.NBT.B.5

Fix a regrouping error

Individual task

Practice problem

Grade 2 · 2.NBT.B.5

Fix a subtraction error

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Explain an exchange in addition

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Explain a rename in subtraction

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Practice a zero-crossing subtraction

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Estimate before solving

Individual task

Practice problem

Grade 2 · 2.NBT.B.9

Find a missing addend

Individual task

Practice problem

Grade 2 · 2.NBT.B.9

Decide if an estimate is reasonable

Individual task

Practice problem

Grade 2 · 2.NBT.B.8

Add 100 and describe the change

Individual task

Practice problem

Grade 2 · 2.NBT.B.8

Subtract 10 and describe the change

Individual task

Practice problem

Grade 2 · 2.NBT.A.1

See hundreds

Individual task

Practice problem

Grade 2 · 2.NBT.A.1

Read expanded form

Individual task

Practice problem

Grade 2 · 2.NBT.A.1

Compare hundreds

Individual task

Practice problem

Grade 2 · 2.NBT.A.1

Skip-count by tens

Individual task

Practice problem

Grade 2 · 2.NBT.B.5

Add by tens and ones

Individual task

Practice problem

Grade 2 · 2.NBT.B.5

Subtract by place value

Individual task

Practice problem

Grade 2 · 2.NBT.B.5

Add four amounts

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Add hundreds

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Subtract hundreds

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Cross zero regrouping

Individual task

Practice problem

Grade 2 · 2.NBT.B.7

Estimate a sum

Individual task

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