It is not free, but Tapestry has created an account for every child. Reach out to your child's teacher.
The website is free on a desktop/laptop. The app costs money. ABCYa has many engaging games to reenforce common core math standards.
Topic C: Numbers to 5 in Different Configurations, Math Drawings, and Expressions
Topic E: Working with Numbers 6-8 in Different Configurations
Topic F: Working with Numbers 9-10 in Different Configurations
Model with a 10 Frame
Magic Math Fingers
A Parents Guide to Rekenreks
Cardinality
Zero the Hero
How to Count Scattered and Circular Arrays with Manipulatives
By: Claire in the Excellent Elephants
How to Count Scattered and Circular Arrays on Paper
By: Zyaah' in the Excellent Elephants
Count to 100
Adding and Counting Strategy: One More
Subtracting and Counting Strategy: One Less
More Fewer Same
The Elephant Mass Song
More and Less
Number Partners to 10
Number Bonds
Hidden Partners
Topic B: Compose Numbers 11-20 from 10 Ones and Some Ones; Represent and Write Teen Numbers
Topic D: Extend the Say Ten and Regular Count Sequence to 100
Topic E: Represent and Apply Compositions and Decompositions of Teen Numbers
Games/Activities to support your child at home with topics within Module 6