Direct intstrcution
https://www.bookwidgets.com/blog/2019/03/direct-instruction-a-practical-guide-to-effective-teaching
Numerical fluency
links to numerical fluency research
Make up work
https://www.sciencedirect.com/science/article/abs/pii/S1747938X16300628
https://www.tandfonline.com/doi/abs/10.1080/09645292.2016.1178213
https://www.tandfonline.com/doi/abs/10.1080/135467999387289
https://www.cusd200.org/cms/lib/IL01001538/Centricity/Domain/1018/FluencyWithoutFear-2015.pdf
https://www.nctm.org/Standards-and-Positions/Position-Statements/Procedural-Fluency-in-Mathematics/
https://news.stanford.edu/2015/01/29/math-learning-boaler-012915/