587 - = 134 + 453 , 333 - = 456-123 , 441 - = 897 - 456 , 899 - = 581 + 318, 989 - = 678 + 311, 443 - = 554 - 111, 755 - = 989 - 234, 589 - = 234 + 355,

Addition and Subtraction within 1000 (no regrouping)

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?