第1单元 第2课时 加减混合运算（课件PPT）-【优翼·学练优】2022-2023学年二年级数学上册同步备课（苏教版）

苏教版二年级上册 加减混合运算 第一单元·100以内的加法和减法(三) www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 情境导入 他们在做什么？ www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 新知探究 男生一共折了38只。 女生一共折了42只。 送给幼儿园33只，还剩多少只？ www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 新知探究 想一想先算什么，再接着往下算。 38 + 42 ? ? 8 0 - 33 ? ? 4 7 = 47 () 只 ＋ 38 42 － 33 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 60 - 38 ? ? 2 2 + 40 ? ? 6 2 试一试 “22+40”可以口算。 = 62 － 60 38 + 40 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 50-26+49= 73 45+38-24= 59 44+52-37= 59 74-27+36= 83 详解 详解 详解 详解 想想做做 1. 【点击详解可见具体解题过程】 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 +20 -6 2. 67 61 51 45 45 39 47 31 25 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 35-14+40= 61 47+16-8= 55 40+26+15= 81 83-30-29= 24 详解 详解 详解 详解 想想做做 3.计算下面各题，能口算的就口算。 【点击详解可见具体解题过程】 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com 想想做做 （1）还剩多少棵？ 4. － 45 37 = 8 （） 棵 答：还剩8棵。 www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com www.youyi100.com w