课件10张PPT。十 几 减 九 八 七 六 的
退 位 减 法? 13 15 ( )
10 ( ) 5 ( ) 7 10 14 16 ( )
( ) 10 6 ( ) 10 23101741012?10-8= 10-9= 10-6=
10-5= 12-2= 17-7=
11-1= 12-2= 10-7=
10-6= 13-3= 18-8=我有13个气球。布置房间要用9个。还剩多少个?15 – 8 =
13 – 7 =
11 – 6 =?14 – 8 = 12 – 9 = 11 – 7 =
13 – 6 = 16 – 7 = 15 – 8 =
17 – 9 = 16 – 8 = 18 – 9 =请用你自己喜欢的方法算一算 9 =
8 =
11 –
7 =
6 = 6 =
7 =
12–
8 =
9 =23456543?15 – 9 = 5 + 9 = 7 + 9 = 13 – 8 =
7 + 5= 18 – 9 = 16 – 8 = 2 + 9 =
17 – 9 = 11 – 7 = 12 – 9 = 11 – 8 =( 注 意 +、 – 号 )( )— ( )= 7???