Januar 29, 2015
Khan Academy Originaltitel: Creating a number grid – https://www.khanacademy.org/math/early-math/cc-early-math-counting-topic/cc-early-math-counting/v/number-grid Übungen: https://www.khanacademy.org/math/early-math/cc-early-math-counting-topic/cc-early-math-counting/e/count-to-100