课件39张PPT。复习:9+2= 8+6= 7+4=
6+5= 5+9= 4+7=
8+5= 7+5= 8+3=
9+5= 7+8= 5+7=11141111141113121114151211-( )=10112-( )=10213-( )=10314-( )=10415-( )=10516-( )=106984655摆一摆,算一算。10-9=1;1+( )=( )。9+( )=12;
12-9=( )。3你喜欢哪种方法?
还可以怎样计算?33236做减法,想加法。13-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-99837524615-914-917-912-911-916-913-9918-9我们一队有12个男生老师让两个男生之间
插进一个女生123456789101112答:一共可以插进11个女生。书本P2611 - 9 = 212 - 9 = 313 - 9 = 414 - 9 = 515 - 9 = 616 - 9 = 717 - 9 = 818 - 9 = 911 - 9 = 2
12 - 9 = 3
13 - 9 = 4
14 - 9 = 5
15 - 9 = 6
16 - 9 = 7
17 - 9 = 8
18 - 9 = 9十几减9,
是几加1﹥﹤= ﹤ ﹤﹥ 给﹥、﹤、或=找个家 。
12-9 ○ 4 11-9 ○ 11+9
?
13-3 ○ 13-9 18- 9 ○ 9
13-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-9837524615-914-918-917-912-911-916-913-99837524615-914-917-912-911-916-913-9918-9我们一队有12个男生老师让两个男生之间
插进一个女生123456789101112答:一共可以插进11个女生。树上原来有14只小鸟,飞走了9只小鸟。原来有15个松果,小松鼠搬走了9 个。14-9=5(只)15-9=6(个)