Strategies used in teaching the decimal metric system in Escuela Nueva. A systematic review

The aim of this study is to synthesise the strategies implemented in the teaching of the Decimal Metric System in the Escuela Nueva pedagogical model, through a systematic review of the literature. This literature review will focus on scientific productions found in high impact indexed journals, endorsed by H-index. To carry out the above, a qualitative methodology was used, making use of methodological guidelines established by Preferred Reporting Items for Systematic Reviews and Meta-Analyses. Inclusion criteria, exclusion criteria, bibliometric variables, and variables of interest on the content were taken into account. Likewise, strategies based on Boolean operators and key terms were used to search for research articles. One of the results obtained is the use of contexts that are close or real to the students so that they can internalise the mathematical object present in this research.