### Teacher Resource

## Support Videos for the Common Core State Standards - Grade: 1, Mathematics 1.OA.6 by SEDL

### Subject

Mathematics (NYS P-12 Common Core)

### Grade Levels

Elementary, 1st Grade

### Description

*The Common Core State Standards (CCSS) videos are designed to support states, schools, and teachers in the implementation of the CCSS. The videos were created in collaboration with the states in the Southeast Comprehensive Center region based on their needs for professional development support for the implementation of the Common Core State Standards. Each video is an audiovisual resource that focuses on one specific standard and usually includes examples/illustrations geared to enhancing understanding. The intent of each content-focused video is to clarify the meaning of the individual standard rather than to be a guide on how to teach each standard although the examples can be adapted for instructional use.*

Content of this video: Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

### Resource

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