September 10, 2013
Khan Academy Originaltitel: Borrowing once example 1 – https://www.khanacademy.org/math/arithmetic/addition-subtraction/sub_borrowing/v/borrowing-once-example-1 Übungen: https://www.khanacademy.org/math/arithmetic/addition-subtraction/sub_borrowing/e/subtraction_3 Dieses