Free resources to use:
PBS Kids: https://pbskids.org
Funbrain: https://www.funbrain.com
Wonderopolis: https://wonderopolis.org
Time for Kids: https://www.timeforkids.com/g34/?age=child
National Geographic Kids: https://kids.nationalgeographic.com
Cool Math Games.com (for math practice): https://www.coolmath.com/0-cool-math-games-and-problems
Khan Academy: https://www.khanacademy.org/math