Represent and solve problems involving addition and subtraction.

Understand and apply properties of operations and the relationship between addition and subtraction.

Add and subtract within 20.

Work with addition and subtraction equations. Extending the counting sequence.

Understand place value.

Use place value understanding and properties of operations to add and subtract.

Measure lengths indirectly and by iterating length units.

Tell and write time.

Represent and interpret data.

Reason with shapes and their attributes.