10 - 8 = - 2, 9 - 6 = - 3, 10 - 3 = - 7, 10 - 2 = - 8, 10 - 1 = - 9,

Unit 2: Challenge: Subtraction Within 10

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?