MA19.2.2
Fluently add and subtract within 20 using mental strategies such as counting on, making ten, decomposing a number leading to ten, using the relationship between addition and subtraction, and creating equivalent but easier or known sums.
Fluently add and subtract within 20 using mental strategies such as counting on, making ten, decomposing a number leading to ten, using the relationship between addition and subtraction, and creating equivalent but easier or known sums.
Unpacked Content
UP:MA19.2.2
Vocabulary
- Fluently
Knowledge
Students know:
- how to use mental strategies to add and subtract within 20.
Skills
Students are able to:
- use addition and subtraction strategies efficiently.
Understanding
Students understand that:
- fluency involves a mixture of "just knowing" answers, knowing answers from patterns, and knowing answers from the use of strategies. The word fluently is used in the standards to mean accurately, efficiently, and flexibly.
