Вправи 501 - 600 » 504-505

504. 800 – 200 = 600; 600 + 300 = 900; 900 – 500 = 400; 700 + 300 = 1000. 505. 689 < 690; 458 < 485; 504 < 540; 367 < 637; 760 > 759; 839 < 893.