# Day by Day: Investigating Variation in Elementary Mathematics Instruction That Supports the Common Core

> Research article (Educational Researcher, 2020) · cited 18× · AI/ML

**Wikidata**: [openalex:W3010187961](https://www.wikidata.org/wiki/openalex:W3010187961)  
**Source**: https://4ort.xyz/entity/day-by-day-investigating-variation-in-elementary-mathematics-instruction-that-supports-the-common-core