Best Learning Games

What are some good free learning games and websites for my kids while they’re out of school for the summer?

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I have kids going into the 1st, 4th & 5th grades. I’m looking for something they can do that’s fun and educational that will keep them out of trouble and out of my hair.

Thanks in advance for any suggestions.

What are some good learning games for kids 3-5?

I have a daughter and son that are 3 and 5, respectively. What are some fun games I could play or things I could do that would be a lot of fun but will teach them something?