课件17张PPT。1.3快乐的小鸭第一单元 加与减(一)
8+5= 8+3= 8+2=
8+8= 8+7= 8+6=1110161514口算13知识回顾
8+( )=10 8+( )=13
8+( )=16 8+( )=14
8+( )=11 8+( )=1758639填空2情境引入草地上还有多少只?一个一个地减…… 512 – 7 = 自主预习5把7分成2和5,
12-7=10-5=512-2=10,新知探究 想:7 + ( )= 12512–7 =5
10-7=3,53+2=512 - 7 =从10里减去7, 5 12 7 - 5511 - 6 =10 – 6 = 4,4 + 1 = 55814 - 6 =10 – 6 = 4,4 + 4 = 88510 - 7 = 311 - 7 = 412 - 7 = 513 - 7 = 614 - 7 = 715 - 7 = 816 - 7 = 917 - 7 = 10知识梳理“十几减 ”怎么算简便?710 - 6 = 4
11 - 6 = 5
12 - 6 = 6
13 - 6 = 7
14 - 6 = 8
15 - 6 = 9
16 - 6 = 10。“十几减 ”怎么算简便?67随堂练习67-6114681414689698558713-7613-676+713说一说