Math Lesson Plans: This resource from CUNY in New York are pdf lesson plans. It is very comprehensive and essentially a curriculum. They are teacher resources for classroom use. Teachers can certainly share them as attachments and use them in virtual classrooms. I, Sherry, give it two thumbs up!
Math Mobile Learning Apps: This website has math apps that are interactive and focus on conceptual understanding as well as procedural: https://www.mathlearningcenter.org/resources/apps/fractions
Keeping Adult Learners Engaged in Worthwhile Math Experiences Online: PDF guide from SABES Curriculum & Instruction PD Center
Using Digital Literacy to Open Up Math Word Problems: This resource provides some examples of how digital literacy can be used to open up traditional math problems to increase student engagement and deepen content knowledge: https://www.sabes.org/content/using-digital-literacy-open-math-word-problems