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Beast Academy online (subscription $) has video explanations for each topic. Video isn't the main focus, though, and it's only suitable once a child can read.

gus_massa mentioned Numberblocks. I think it's worth watching every video and, once done, starting over from episode 1. So much nice content, especially about multiplication and primes.

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Second the Beast Academy recommendation. I'd add, it's the younger version of Art of Problem Solving. The interactive games are extremely well designed from a pedagogical standpoint, the videos are fun and clear, the visuals are appealing, etc. (And I will say, there's a TTS button on the screen so that a kid who can't read can still hear the instructions, which are usually pretty intuitive anyway, especially after the video walkthrough. And the accompanying comics have proven more supplemental than essential for us.)

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