Genesiscurriculum . com has “A Mind for Math” which is for teaching grades 1-4 math together. Each grade has their own level of workbook.
Rays for Today is self-teaching at the higher levels.
We are trying Shiller Math with Math Mammoth for my one who wants independent work.
Rays for Today wasn’t enough variety for her. She is a tough case.
The Good and the Beautiful Math is supposed to have videos for 3rd grade, but it isn’t published yet. My younger two will use The Good and the Beautiful Math.