9的乘法口诀和用口诀求商

9的乘法口诀?和用口诀求商Р小兔子跳格子Р(1) 0 7 14 21 ( )( )( )Р(2)0 8 16 ( )( )( )( )( )Р28Р35Р42Р24Р32Р40Р48Р56Р编口诀:Р你能编出9的乘法口诀吗?Р一九得九四九( ) 七九( )? 二九( ) 五九( ) 八九( )? 三九( ) 六九( ) 九九( )Р十八Р二十七Р五十四Р四十五Р七十二Р六十三Р三十六Р八十一Р27Р36Р54Р45Р63Р72Р81Р记一记:Р是81Р比90少9Р9个9Р是72Р比80少8Р8个9Р是63Р比70少7Р7个9Р是54Р比60少6Р6个9Р是45Р比50少5Р5个9Р是36Р比40少4Р4个9Р是27Р比30少3Р3个9Р是18Р比20少2Р2个9Р是 9Р比10少1Р1个9Р2×9=Р18Р18Р18÷9=Р2Р18÷2=Р9Р都用哪句口诀?Р二九十八Р9× 2 =Р试一试:Р先把乘法口诀填完整,再计算。Р四九( ) 五九( ) 八九( )Р三十六Р36Р36Р4Р9Р9×4 =? 4×9 = ?36÷9 = 36÷4 =Р七十二Р72Р72Р8Р9Р9×8 = ? 8×9 =?72÷9 =?72÷8 =Р四十五Р9×5 =?5×9 = ?45÷9 =?45÷5 =Р9Р5Р45Р45Р口算:Р6× 9 = 9 × 3 = 7 × 9 = 9 × 9=Р54÷9 = 27÷ 9 = 63÷ 9 = 81÷ 9 =Р54Р6Р27Р3Р63Р7Р81Р9Р3×9Р9×7Р18÷2Р9×8Р36÷9Р9÷9Р54÷9Р看谁算得快: