Unpacked Content
Knowledge
Students know:
- The relationship between addition and subtraction.
- how to explain subtraction as an unknown addend.
Skills
Students are able to:
- use symbols such as blanks, boxes, or letters to represent unknown quantities in equations.
- Communicate the connections between subtraction and addition.
- Use the inverse relationship between addition and subtraction to find differences.
- Choose and apply addition and subtraction strategies to accurately determine sums and differences within 20.
Understanding
Students understand that:
- addition and subtraction have an inverse relationship that can be used to solve problems.
Vocabulary
- Addend
