Unpacked Content
Knowledge
Students know:
- strategies for finding sums and differences.
- physical (manipulative) models and pictorial models (place value blocks, lines and dots, bundles and sticks, etc.) for representing numbers using place value concepts.
Skills
Students are able to:
- use logical reasoning, place value concepts and vocabulary, and properties of numbers and operations to justify strategies for finding sums and differences.
Understanding
Students understand that:
- relationships between models of addition and subtraction problems and symbolic recordings of those models can be used to justify solutions and strategies.
Vocabulary
- Properties of operations
