U1、 Hanging around the park - subtraction within twenty 一、逛公园——20以内的退位减法 The first lesson 第一课 We come in class for a total of fifteen people. 咱们班一共来了15人。 There were nine female students. 有9个女生。 There were several boys? 有几个男生? A total of seventeen balloons, nine were sold. 一共有17个气球，卖了9个。 What questions are you still asking? 你还能提出什么问题? You say I say 你说我讲 There were several boys? 有几个男生? Fifteen minus nine equals 15-9= (个) Nine plus six is fifteen 9+6=15 Fifteen minus nine is six 15-9=6 Divide nine into five and four. 把9分成5和4。 Fifteen minus five is ten 15- 5= 10 Ten minus four is six 10-4=6 Take four more. 再拿走4个。 Take five first. 先拿走5个。 Ten minus nine is one 10-9=1 one plus five equals six 1+5=6 How many balloons are left? 还剩几个气球? Lesson Two 第二课 There were fifteen boats in total, and eight were rowed away. 一共有15只船，划走了8只。 There are sixteen bottles of mineral water. 有16瓶矿泉水。 We'll buy seven bottles. 我们买7瓶。 What questions can you ask? 你能提出什么问题? You say I say 你说我讲 How many boats are left? 还剩几只船? Fifteen minus eight equals 15-8= (只) Eight plus seven equals fifteen 8+7=15 Fifteen minus eight equals eight 15-8=7 Fifteen can be divided into ten and five. 15可以分成10和5。 Ten minus eight equals two 10-8=2 Two plus five equals seven 2+5=7 eight can be divided into five and three. 8可以分成5和3。 15-5=10 Ten minus three equals seven 10-3=7 How many bottles are left? 还剩几瓶? Lesson 3 第三课 Xiaoxin 小新 I bought twelve fish and fed three. 我买了12条鱼，喂了3条。 Xiaoliang 小亮 I bought fourteen fish and fed six. 我买了14条鱼，喂了6条。 What questions can you ask? 你能提出什么问题? You say I say 你说我讲 How many fish are left in Xiaoliang? 小亮还剩几条鱼? Fourteen minus six equals 14-6= (条) Six plus eight equals fourteen 6+8=14 fourteen minus six equals eight 14-6=8 Ten minus six equals four 10-6=4 Four plus four equals eight 4+4=8 How many fish are left in Xiaoxin? 小新还剩几条鱼? |
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