Математика, 3 класс

видео-уроки: 1). https://www.youtube.com/watch?v=fQA2bWiThCY&ab_channel=%D0%9F%D1%80%D0%BE%D1%81%D1%82%D0%BE%D0%BE%D1%81%D0%BB%D0%BE%D0%B6%D0%BD%D0%BE%D0%BC.%D0%9D%D0%B0%D1%87%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F%D1%88%D0%BA%D0%BE%D0%BB%D0%B0 2). https://www.youtube.com/watch?v=6aLq2KvqIVg&ab_channel=%D0%92%D0%BC%D0%B5%D1%81%D1%82%D0%BE%D1%80%D0%B5%D0%BF%D0%B5%D1%82%D0%B8%D1%82%D0%BE%D1%80%D0%B0%D0%95%D0%BB%D0%B5%D0%BD%D0%B0%D0%92%D0%B8%D0%BA%D1%82%D0%BE%D1%80%D0%BE%D0%B2%D0%BD%D0%B0