Education target

1.Make the student is passed observe and think, master and be the computational method of the addition of 10 and corresponding subtration, have consideration correctly.

2.Make student experience lists according to a graph two addition calculate type and the process that two path subtration calculate type, initial experience calculates the connection between type 4 times.

3.Make the student experiences the process that solves real problem, experience the connection of maths and life, generate the interest that learns to maths.

Education process

One, circumstances introduces

Talk: Do children like a football? Then we watch game of a football together.

2, have new tax

1.Education example.

Show example circumstances to pursue.

Quiz: Ask a child to watch this figure carefully, what did in saying to pursue from this, you know? (left has 6 people, right has 4 people; Wear a hat have 1 person, do not have those who wear a hat to have 9 people... )

Ask again: What question can you raise? (guide a student to be conveyed thoroughly with 3 words, and camera uses vinculum, interrogation to wait in circumstances graph show a condition and issue)

Talk: The child is really marvelous, not only made clear the meaning of the graph, still raised a lot of different questions, we resolve the question that everybody raises below.

Show an issue 1 (graph meaning: Left has 6 people, right has 4 people, altogether has how many person) .

Quiz: How to calculate altogether how to many person there is? Can you list type? How can you still list type? (writing on blackboard: 6 4 = 4 6 = )

Ask again: You can does cipher out calculate the result of type twice this? (emphasize saying is how of cipher out 6 4 = 10, it is OK to emphasize according to 6 4 = 10, draw up directly the result of 4 6)

Show an issue 2 (graph meaning: Altogether has 10 people, left has 6 people, right has how many person) .

Quiz: Want to calculate right to have how many person, how should list type? (writing on blackboard: 10 - 6 = )

Ask again: How cipher out 10 decrease 6 be equal to a few? (the student is calculated with his method, emphasize the method that guides student experience to calculate type to think subtration calculates type result according to addition)

Show an issue 3 (graph meaning: Altogether has 10 people, right has 4 people, left has how many person) .

Quiz: You can be listed calculate type, result of very fast cipher out?

The student lists type, and cipher out result.

[Review analyse: From actual circumstances proceed with, guide student experience to gather information, offer the problem, course that solves a problem, brought a student into play to share the enthusiasm that studies an activity, rose to learn mobile efficiency. In the meantime, requirement student uses 3 words (two conditions, a problem) expressive graph meaning, permeated add, subtration is actual the structure of the problem and quantitative impact. The methodological calculative that encouraging a student to use his at the same time, guide student basis in front calculate type to want from the back the result that calculates type, make initial move cicada adds the student already, the connection of subtration, promoted algorithm again optimize. Promoted algorithm again optimize..
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