26:06Learning
From the PhD Lab: How do biofilms help keep bacteria alive? - with Josh Horton
The Royal Institution
Level 2 Addition
From the creator
Adding a 2 digit number to a 1 digit number. Introduction to carrying. More free lessons at: http://www.khanacademy.org/video?v=27Kp7HJYj2c
Published 2007-03-10 · Watch on YouTube ↗
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