ІІ ЧАСТИНА. I. Тисяча » 47
800 + 80 + 8 = 888; 400 + 40 + 4 = 444; 900 + 1 = 901; 900 – 1 = 899; 600 + 60 = 660; 400 + 40 = 440; 500 + 100 = 600; 600 – 400 = 200.
800 + 80 + 8 = 888; 400 + 40 + 4 = 444; 900 + 1 = 901; 900 – 1 = 899; 600 + 60 = 660; 400 + 40 = 440; 500 + 100 = 600; 600 – 400 = 200.