Unit-five The seagulls are back——11-20recognition of each number(海鸥回来了——11-20各数的认识) LESSON ONE 第一课 Knowledge of the numbers from eleven to twenty How many seagulls are there on the beach? 沙滩上有多少只海鸥？ You can learn with the help of tools. 可以借助学具来学习。 There is a ten and a one in eleven. 11里面有1个十和1个一。 From the right, the first is one, the second is ten . 从右边起第一位是个位，第二位是十位。 How many gulls are there on the reef ? 礁石上有多少只海鸥？ I count with a stick. 我用小棒数一数。 I use the counter to dial. 我用计数器拨一拨。 Two ten is twenty. 2个十是20。 Let’s practice! 我们来练习一下吧！ LESSON TWO 第二课 Add without carry and subtract without abdication within 20 How many seagulls are there in the sky? 天空中一共有多少只海鸥？ Twelve plus three is fifteen. 12+3=15 Let’s wiggle and wiggle. 我们来摆一摆、拨一拨。 What else can we do? 还可以怎样算？ There are seventeen barrels in a crate. Four have been fed. How many are left? 一箱有17桶，已经喂了四桶，还剩下多少桶？ Seventeen minus four is thirteen. 17-4=13 Addition plus addendum equals sum. 加数+加数=和 Minuend minus minuend equals difference. 被减数-减数=差 Let’s practice! 我们来练习一下吧！ LESSON THREE 第三课 As much Fangfang made fourteen flowers. 芳芳做了14朵花。 Jingjing made ten flowers. 晶晶做了10朵花。 How many flowers does fangfang give jingjing, and how many flowers do they have? 芳芳给晶晶几朵花，两人的花就一样多？ Give it a swing with a study tool. 用学具摆一摆。 You can figure it out by drawing it. 可以利用画图的方法来找出答案。 Let’s solve the problem. 我们来解决问题。 Let’s practice! 我们来练习一下吧！ |
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