Math 7A, Lesson 4, 9/28/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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We introduce Cartesian Coordinate System, how to plot points in the coordinate system, the quadrants.

We look at linear graphs, how to draw them and interpret them.

Homework: Page 9, #1 – #8.

 

About Math 7A

Weidong Posted in Fall 2014, Teaching info
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[Since some parents said they didn’t get my email last week, I am posting it here. BTW, the email must have gone into your Spam or Bulk folder. You should get into a habit to periodically check that folder.]

Dear parents:

I hope by now your child is in the right class and everyone has got his workbook. I have several students who just got their books last Sunday, hence they didn’t do their homework for last week.

I need your cooperation to make sure that your child is indeed learning. One thing I have been telling the students is that they should have one notebook to take notes in the classroom, then they should have another for doing the homework. One way you can help is to check his classroom notebook to see if he has taken any note. Some students came to the class empty handed, no pen/pencil, no notebook, had to borrow a piece of paper and a pen from others. Also, please check my blog site at least weekly to know the homework and make sure that your child is doing his homework.

You should also encourage your child to participate more in the classroom, don’t be afraid of asking questions or making mistakes.

Thanks for your help.

Math 7A, Lesson 3, 9/21/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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We focus on geometric sequences. A geometric sequence is a sequence where the ratio between any two consecutive terms is always the same. We usually use r to represent this common ratio.

So for a geometric sequence whose first term is a and whose common ratio is r, its nth term is:

an  = ar^(n-1)

Keep in mind that the complete sequence of a geometric sequence is determined by a particular term and the common ratio.

We did a bunch of exercises in the classroom.

Homework:

http://blog.newtonchineseschool.org/wangweidong/files/2014/09/HomeworkGeometricSequence.pdf

 

Math 7A, Lesson 2, 9/14/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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We focus on Arithmetic sequences. An arithmetic sequence is a sequence where the difference between any two consecutive terms is always the same. We usually use d to represent this common difference.

So for an arithmetic sequence whose first term is a and whose common difference is d, its nth term is:

an  = a + (n-1)d

Keep in mind that the complete sequence of an arithmetic sequence is determined by a particular term and the common difference.

We did a bunch of exercises in the classroom.

Homework: Workbook Page 4, #21, #22, #26, #27 and the following:

http://blog.newtonchineseschool.org/wangweidong/files/2014/09/HomeworkArithmeticSequence.pdf

 

 

Math 7A, Lesson 1, 9/7/2014

Weidong Posted in Fall 2014, Homework, Teaching info
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We covered number patterns, sequence, and general term of a sequence.

An ordered list of numbers is called a sequence. Each number in a sequence is called a term, and is identified by its position in the ordered list.

Terms are usually denoted by T1, T2, T3, …, or a1, a2, a3, … Note the use of subscripts to identify the positions.

The nth term of a sequence is called a general term of the sequence. And if we can use a formula to represent the general term, then we can find any term in the sequence of substituting in a real value.

For example, given Tn = n^2 + 2n -1, we can easily find T1, T101, T31, etc. by setting n to a particular value.

We looked at real world examples of number patterns.

Homework: workbook page 1:

1a – 1d, 2e – 2h, 3(a, c, e, g), 4(b, d, f, h), 5(a, c, e), 8, 9, 10, 12, 14, 16, 18, 19