Students completing grades 2 - 5 in Weston all have Khan Academy accounts that were used throughout the year. Teachers may have assigned content strategically to match the content of the grade. If your child enjoyed this platform, they are free to continue work in their account. They should choose "Courses" and choose the grade they just completed. They can then work through the rest of the material in a self-directed manner, rather than by teacher assignment. In most cases, we recommend against choosing material from the next grade. An alternative would be to choose the "Getting Ready For" courses. khanacademy.org
For incoming K - 2 students, there is an app, Khan Kids, that is better designed for this age student. We encourage the use of that for self-directed, summer math .learn.khanacademy.org/khan-academy-kids/
This site has excellent games that promote fluency and number sense. He even has his own summer challenge that you might enjoy.
Please note this site is free due to related advertising, so parents should be watchful, especially of younger students who may mis-click.
Thinking blocks has excellent and engaging problem solving practice using the bar model strategy. It is now hosted on Math Playground that does have advertising, so parents should be watchful, especially of younger students who may mis-click.
BrainPop offers some excellent math games that practice skills while incorporating strategic thinking.