第九课

供进一步研究

- (2016) 什么是分数?Letstute的分数介绍;YouTube
https://www.youtube.com/watch?v=zQuUNE50JnM

- (2016)将分数转换成小数,Numberock的Math Songs之歌;YouTube
https://www.youtube.com/watch?v=WV5VY76Pf5U

- (2021)小数的位置值; Khana学院
https://www.khanacademy.org/kmap/numbers-and-operations-f/decimals-place-value