Repaso 6ºB

Sumas y restas.

https://video.wixstatic.com/video/486964_1c761edff67148b5bc0761c97e34d47e/1080p/mp4/file.mp4

https://video.wixstatic.com/video/486964_e8aaaf3004b44175806709d79df4e27f/1080p/mp4/file.mp4