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Practice problem

Grade 2 · 2.OA.A.1

Find the unknown change

Individual task

Practice problem

Grade 2 · 2.OA.A.1

Choose the operation

Individual task

Practice problem

Grade 2 · 2.NBT.A.2

Count backward by tens

Individual task

Practice problem

Grade 2 · 2.NBT.A.2

Find a missing number in a sequence

Individual task

Practice problem

Grade 2 · 2.NBT.A.2

Count by fives on a number table

Individual task

Practice problem

Grade 2 · 2.NBT.A.4

Compare across a zero

Individual task

Practice problem

Grade 2 · 2.NBT.B.5

Compare two addition strategies

Individual task

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.OA.A.1

Join a story

Individual task

Practice problem

Grade 2 · 2.OA.A.1

Separate a story

Individual task

Practice problem

Grade 2 · 2.OA.A.1

Find the start

Individual task

Practice problem

Grade 2 · 2.OA.A.1

Find the change

Individual task

Practice problem

Grade 2 · 2.OA.A.1

Compare two groups

Individual task

Practice problem

Grade 2 · 2.OA.A.1

Two-step story

Individual task

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