课件21张PPT。10+1= 10+3= 10+5= 10+7=
9+1+7= 9+1+6= 9+1+4= 9+1+8=7根据数的组成填空:
85141361819121想一想9 +( )=109 + 1 + 1 =
9 + 1 + 6 =
9 + 1 + 7 =
1010101116171你发现了什么?算一算10,11,12,13。9 + 4 =139 + 4 =139 + 4 =1310139 + 7 =16
10169 + 7 =1015159 + =312 + =9817凑十法
? 圈一圈
? 分一分
? 凑成十
? 算得数1111141418189+1+49+1+1 9 + 29 + 59 + 99+1+8???9+5=9+2=9+4=9+6=9+0=9+1=9+8=9+3=9+7=9+ 9=9+10=141113159101712161819101112131415161718谢谢光临 !
请多指导!