1. Overall goal:
(1) can correctly count the number of objects between 1 1-20, know that these numbers are composed of a ten and several ones, and master the order and size of numbers within 20.
(2) A preliminary understanding of "ten digits" and "single digits" and a preliminary understanding of the decimal system; Can read and write the number 1 1-20 correctly.
(3) Be able to skillfully calculate the addition and subtraction of 10.
2. Sub-goals of class hours
(1), the goal of the first class: "1 1-20 Logarithm Understanding"
A accurately read and count the numbers of 1 1-20, and master the order and size of the numbers within 20.
B. Understand the counting units "ten" and "one" initially, and intuitively understand that each number of 1 1-20 is composed of a ten and several ones.
(2)。 The goal of the second class: "How to write the number 1 1-20"
Have a preliminary understanding of "ten digits" and "single digits", know the counter, and write the number of 1 1-20 correctly.
B through observation, operation and expression, cultivate students' observation ability, hands-on operation ability and transfer analogy ability.
C. cultivate students' good writing habits.
(3)。 The third kind of goal: "10 plus a few and the corresponding subtraction"
A consolidate the understanding of 1 1-20 through practical operation, and prepare for the next step of learning carry addition.
B. Using the number of 1 1-20, master the calculation method of 10 plus several and the corresponding subtraction to calculate correctly.
(4) The goal of the fourth class: "Mixed practice of 10 plus several and corresponding subtraction" prepares for teaching carry addition and abdication subtraction in 20 years through the mixed practice of 10 plus several and corresponding subtraction and the content learned before.
Second, the knowledge structure diagram of this unit
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Third, the context of unit learning content:
Related content that has been learned.
Synthesis and decomposition of numbers within 10
Addition and subtraction within 10
The main content of this unit
Understanding of Numbers in 1 1-20
Units, Decimals and Decimals
10 plus several and the corresponding subtraction.
Related content of follow-up study
Carry addition in 20:
9 plus a few
What's eight, seven and six?
5, 4, 3, 2 within 20 plus several abdication subtractions.
Fourth, the analysis of teaching emphasis
1. The first lesson: Know the number of 1 1-20.
(1) teaching focus:
Understanding and composition of the number 1 1-20
Analysis of the key elements included in this focus:
A knows 1 1-20, and will use each number of 1 1-20 to represent the number of objects. From a specific object or person, the number 1 1-20 will be abstracted to describe it.
B. Knowing the counting units of "ten" and "one", intuitively understand that each number of 1 1-20 is composed of a ten and several ones.
C knows the order of 1 1-20, and the latter number is more than the previous number 1.
(2) Contact other teaching points:
Cardinal meaning, ordinal meaning, composition and proportion of numbers, 1-20. Students can correctly use 1 1-20 to represent specific things or people, which is the basis for students to abstract numbers from scenes for further study.
(3) Strategies to highlight key points:
Create scenes, learn to count and recognize numbers. Show the theme map, let students integrate into the classroom and feel that mathematics is closely related to life; Through group cooperation, exchange observation content, cultivate students' observation ability, language expression ability and hands-on operation ability.