Multiple Digit Multiplication

2 Digit x 1 Digit Multiplication
For the past couple of weeks we have been learning multiple digit multiplication. First, students learned about 2 digit by 1 digit multiplication.



















3 Digit x 1 Digit Multiplication
Next students learned 3 digit by1 digit multiplication. We talked about how this was just one extra step because it was just one extra place value.

 

2 Digit x 2 Digit Multiplication
Finally, students learned 2 ways to multiply 2 digit by 2 digit numbers. The first method is called the turtlehead method. Most students chose to use this method.






































Here is a video we watched in class to help us remember the turtlehead method:
http://www.youtube.com/watch?v=1hcKERTnNi0&noredirect=1

Sorry, for some reason it's not letting me embed the video to this post.

Another method students learned was the Box Method. Some students may find this way to be easier. As always I tell students to use whichever method they are most comfortable with. They always have options.

Estimating Products

Monday, October 7, 2013
Students learned how to use rounding to estimate products.
A few things students must remember:
-You must round first before you do any calculations.
-You must round the number that is not the single digit number.
-You must round to the greatest place value.

EX: 7 x 234 = ---> 234 rounded to the nearest hundred is 200 so we re-write the problem as 7 x 200 = ---> then we multiply 7 times 2 which is 14 then add 2 zeros. The estimated product is 1,400.

Here is a helpful video (full screen to make bigger):

 

 

Reminders: Tomorrow, Thursday October 10th, is Curriculum Night for K-5. There will be different sessions if you plan on attending, here is an overview and schedule of the sessions:

Room 148: Third, Fourth, Fifth Grade Mathematics Curriculum. Presented by Ms. Kominczak, Mrs. Cao, and Mrs. Gayer. Discussion of math curriculum and STAAR Math testing. View EnVision/Pearson website and receive log-in information. Discussion of ways parents can help students at home (STAAR practice, etc.).

Session Times: 5:10 pm; 5:30 pm; 5:50 pm; 6:10 pm

Week of September 30, 2013 - October 4, 2013

Monday, September 30, 2013

Students learned that there are special rules for dividing numbers by 1 and by 0. 

Rule: A number divided by 1 is that number.

Examples: 4 / 1 = 4 or 55 / 1 = 55

 

Rule: A number divided by itself (except 0) is 1.

Examples: 17 / 17 = 1 or 135 / 135 = 1

 

Rule: Zero divided by a number (except 0) is 0.

Examples: 0 / 4 = 0 or 0 / 15 = 0

Rule: You cannot divide a number by zero.
Examples: 7 / 0 cannot be done. 12 / 0 cannot be done.

 

 

 

Students didn't get to watch Division Rules video because my projector lamp went out :(

 

 

Tuesday, October 1, 2013

Students learned to use patterns to multiply by multiples of 10s and hundreds.

An example we talked about in class was:

2x3=6

2x30=60

2x300=600

EX: 6x800 --- First multiply the first non zero digit, 6 times 8 which equals 48 then add 2 zeros, so your product is 4800.

   



Wednesday, October 2, 2013

Students learned CUBES for solving word problems. I sent a copy of CUBES home for students to keep and use for future assignments.

 

 

 

[Edit] Reminders:
-All grades are updated in the grade book/database; this includes test that students took on Friday 10/4/13.
-The end of the first 9 weeks is October 18, 2013. All make up or late work is due Tuesday, October 15, 2013. I will not take any missing work after Tuesday 10/15/13.
-Within the next week, week and a half, we will be taking Math Benchmark 1. I have scheduled Benchmark 1 for Wednesday 10/16/13. I will keep you all updated if there are any changes.

Properties of Multiplication

Tuesday, September 24, 2013

For the first 30 minutes of class, we went over our test that students took on Friday. Most students did well, while some need to slow down and read questions more carefully. In the next few weeks we will learn an acronym for solving word problems and well as the UPSE problem-solving board.

Students learned about the 4 properties of multiplication today. We discussed Commutative Property, Associative Property, Identity Property and Zero Property of Multiplication. Students took the following notes:

 

 

Students then took turns at their table groups to identify each property of multiplication. I wrote a multiplication fact/property on the board and students held up cards to identify which property I wrote.

 



Multiplication: Notes and Making Arrays

Monday, September 23, 2013
Today students studied the meaning of multiplication. We took notes that included ways to show multiplication:

Students also used color tiles to create arrays from multiplication facts that I showed them on the board.

Here is a copy of tonight's Homework (due Wednesday 9/25, click to download)... just in case you weren't able to obtain it from the database.