Long Division - DMSCB

This week students have been learning how to do long division. We learned about the acronym DMSCB which stands for Does McDonald's Sell Cheese Burgers? Each beginning letter in that sentence stands for a step that students must take to do their long division.

Remember: The dividend (number inside our division house) is divided by the divisor (the number outside the house) and we ALWAYS put our quotient/the answer on the top of our house or on the roof.

We did 2 example problems so students could get some practice. We also did some more independent practice problems that I wrote on the board. Please review these practice problems with your child.

Here is a really good video for long division that we watched in class:
http://www.youtube.com/watch?v=dJe3564yY-g

Here is a copy of today's HW - Homework Wednesday 11/6/13 (click to download)

Reminder: Test on Friday 11/8/13 over multiplication (2x1, 3x1, 2x2 multiplication) and division (basic and long division).

Model Drawing

In addition to our other strategies, students learned about drawing models/pictures. Students took notes in their math journals. There were 5 simple steps:




 



If students can utilize these strategies, I believe that they can be successful when working with word problems.

Dividing with Remainder & Using Multiplication Facts to Solve for Division

Dividing with Remainders
Students used tiles to help them divide. I wrote a division fact on the board and students drew groups and used the tiles to divide. We talked about how division is about splitting an amount into smaller equal groups. We also talked about how sometimes there are left overs that we cannot divide evenly into the groups; these are called remainders.

 

Then students learned how to use multiplication facts to solve for division problems.
Students used skip counting to find multiplication facts.

EX: 28 / 5 = ?
First, students determined if 28 would divide evenly into 5 groups. One way we can tell if a dividend divides evenly by the divisor is if the dividend is a multiple of the divisor. I can tell 28 is not going to be divided evenly by 5 because 28 is not a multiple of 5. Students skip counted by 5s in order to find a multiple/product that was close to 28, but does not go over.
5, 10, 15, 20, 25 --- I stop at 25 because if you continue 30 is greater than 25.
We know that 5 x 5 = 25 so 28 / 5 = 5 with a remainder.
We know the difference between 25 and 28 is 3, so my remainder is 3.


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.

Division Notes & Reminder About Parent/Teacher Conferences Tomorrow

Wednesday, September 25, 2013
Today students learned about the meaning of division. Students took notes over division in their math journals. Then students worked with their shoulder buddies to make equal groups. Students were given a problem and they had to draw their Equal Groups (Division Groups) to find the quotient.

 

 



 

Here is Wednesday's Homework (click to download) which has also been uploaded to the database.

 

Reminders: Parent/Teacher conferences are tomorrow (Thursday 9/26/13) from 2-5 pm. Fourth grade teachers will be meeting together as a whole team. We will be having an open door conference. So there will not be a scheduled time to sign up for. There will be a sign in sheet posted outside my door and basically, it's first come first serve. If you feel that the conference may take longer than 15 minutes, feel free to schedule another time after school to meet with us. We feel that this is the best way to hold conferences this year. 

Warm Regards, 

Ms. Cao, Mrs. Cheatham and Mrs. Hanes.