September 10, 2013
Khan Academy Originaltitel: Example: 2-digit subtraction (no borrowing) – https://www.khanacademy.org/math/arithmetic/addition-subtraction/two_dig_add_sub/v/subtracting-whole-numbers Übungen: https://www.khanacademy.org/math/arithmetic/addition-subtraction/two_dig_add_sub/e/subtraction_2

