Adding more

Let’s start

What can you see in this picture?

According to the position (from left to right) How many students together？ 4+3=7 3+4=7 Put two parts together , we can use addition.

There were 3 students at first There were… students on the car at first, and then…students get on the car. Now there are …students on the car. What are they doing? 3 ＋ 1 4 How could you represent that 1 student got on？ There were 3 students at first 1 student got on Now there are 4 students 探究一 探究二 探究三

There were… students on the car at first, and then…students get on the car. Now there are …students on the car. 3 ＋ 1 4 What’s the formula? 3 ＋ 1 ＝ 4 Do you remember the name of every parts? addend＋addend=sum 探究一 探究二 探究三

Who can be a little teacher and ask a question to us according to the video? +2 4 6 4＋２＝６ What’s the formula?

□ 3 5 ＋2 3 5 There were…, add…more. Now there are … There were（ ）apples, （ ）， Now there are（ ）apples.。 3 add 2 more 5 ＋2 □ 3 5 探究一 探究二 探究三

□ 3 ＋ 2 = 5 When we add something more , we can use addition. ＋2 3 5 According to the sentence complete the formula： ＋2 □ 3 5 3 ＋ 2 = 5 When we add something more , we can use addition. 探究一 探究二 探究三

When can we use addition? 1.Put two parts together. conclusion： When can we use addition? 1.Put two parts together. 2.Add something more. 探究一 探究二 探究三

Let’s continue! 探究一 探究二

□ 4＋ 3 = 7 4 3 7 3 ＋ 4 7 What happens with the birds? There were（ ）birds，add（ ）more，now there are（　）birds. 3 7 □ 3 ＋ 4 7 4＋ 3 = 7 探究一 探究二

What had happened？ +1 5 4 +1＝5 4 探究一 探究二

Practice

1.Do you know the sum? 3 +2 3 +3 5 6 3+2＝5 3+3＝6 4 +6 4 +4 10 8 4+4＝8 4+6＝10

2. Which number is missing? 1 +0 1 4 +3 3 6 +3 3+3＝6 1+3＝4 1+0＝1

3. Fill in the blanks. +3 5 +2 6 4 2 4+2＝6 2+3＝5