Using addition to solve large subtractions in the number domain up to 20.
| Image |  |
|---|---|
| Description | scientific article published on 5 December 2009 |
| Author/s | |
| Publication date | December 5, 2009 |
| Language | |
| Country of origin | |
| Wikipedia link | |
| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |