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《1.十几减9》最新教案优质课下载
1. Fill in the blanks
(1) One ten and five ones make_______.
(2) 14 is made up of ______ten and ______ ones.
(3) 20 is made up of ________ tens.
(4) 18 is made up of _______ten and ______ones.
(5) ______ ones and ______ ten make 16.
2. Calculate.
10-9+6= 16-6-5= 14-4-5= 10-9+5=
9+4=9+7= 9+( )=11 9+（ ）=17
The teacher guides the students to check the answers.
Step 2 Presentation
1.The teacher shows the theme picture on the board. (There are 10 apples in the box. There are 3 apples outside the box.)
T: There are 13 apples in total. Jenny takes away 9 apples. How many apples are left?
T: Who can tell me a number sentence?
S: 13-9 (Write down: 13-9)
T: Now, who can tell me the answer?
S: 4.
T: Maybe. How to calculate the number sentence?
Subtraction by decomposing to ten. (“平十法”)
We take away 3 apples. Then, we take away 6 apples. Now, 4 apples are left.
13 - 9 = 13 - 3 - 6
= 10 - 6
= 4
First, we subtract 3 from 13. Then we subtract 6 from 10.
This is the first method. Who has different methods?