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Fun/successful ways to teach dbl. digit multi

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 TeacherCarrie Joined: Jun 2006 Posts: 1,386 Senior Member
TeacherCarrie

Joined: Jun 2006
Posts: 1,386
Senior Member
Fun/successful ways to teach dbl. digit multi
10-01-2006, 04:02 PM
 #1

Does anyone have lessons, suggestions, tips on teaching double digit multiplication to first timers?

My district unfortunately uses TERC math curriculum. With out very very high level of English Learners this has done horrors to the skills needed to move on to harder topics such as double digit mulitplication. My fourth graders are having a hard time learning it...I am supplementing it on my own b/c TERC doesn't teach the process of double digit mulitplication.

I just want some successful and unique ways to teach it. Anyone?

Thanks so much!

 loonfourth Joined: Jun 2006 Posts: 103 Full Member
loonfourth

Joined: Jun 2006
Posts: 103
Full Member
2-digit Multiplication
10-01-2006, 04:27 PM
 #2

Have you tried lattice? Most of my 4th graders prefer that method

 nanz Joined: Jun 2006 Posts: 217 Full Member
nanz

Joined: Jun 2006
Posts: 217
Full Member
Stretch Multipplication
10-01-2006, 05:15 PM
 #3

I use stretch multiplication to first introduce the concept of 2-digit multiplication to my fourth graders. I think it is an AIMS activity. The basic concept is to stretch each digit out to represent its value (expanded notation) and multiply each part. The partial products are then added together. For example: 23 x 45 => (20 x 5) + (3 X 5) + (20 x 40) + (3 x 40)

I tried typing this in a more standard format, but was unable to get it to line up correctly when I previewed its posting. I hope my example is understandable.

 Phyllis Joined: Aug 2005 Posts: 3,170 Senior Member
Phyllis

Joined: Aug 2005
Posts: 3,170
Senior Member
Two things that helped
10-02-2006, 03:18 AM
 #4

Use grid paper so that the columns are kept straight. Make yourself one on the white board too.

Use four different colored markers to demonstrate on the board. Copy the problem in black. Multiply by the one's number using blue. Multiply by the ten's number using green; be sure to put in the place holding zero (some teachers write an x across it. Add the total using red. This helps students see the steps used in solving.

Hope this helps.

 TeacherCarrie Joined: Jun 2006 Posts: 1,386 Senior Member
TeacherCarrie

Joined: Jun 2006
Posts: 1,386
Senior Member

10-02-2006, 05:00 AM
 #5

OMGoodness...I totally forgot about the lattice method that I learned in a Teacher's Math Class in college.

These are all great ideas...thanks ladies! Any one else have any wonderful ideas?

 grade4curlyQ Joined: Jul 2006 Posts: 574 Senior Member

Joined: Jul 2006
Posts: 574
Senior Member
Multiplication
10-07-2006, 03:58 PM
 #6

We're on this skill too. Grid paper is absolutely necessary! Also, explicit numerical representation reinforces the place value and helps my beginners understand the shortcut better when it comes time to introduce it.

See attachment. All of mine but 2 out of 26 really understand the explicit representation. They (those 2) struggle with place value still!

I've been a fiddle fingers with attachments today so I hope I get this one right.
Attached Files
 Explicit Numerical Representation.doc (23.5 KB, 682 views)

 AmyH Joined: Sep 2005 Posts: 689 Senior Member
AmyH

Joined: Sep 2005
Posts: 689
Senior Member
Lattice
10-09-2006, 02:53 PM
 #7

Kids prefer Lattice Multiplication... it's easy, fun and they get the right answer.. I highly recommend it for double digit multiplication. However, I do not allow it for multi-digit times single digit... They do that the regular way and then I make them do it in their heads (well, most of them)..

 Kerri Joined: Oct 2006 Posts: 5 New Member
Kerri

Joined: Oct 2006
Posts: 5
New Member
Stretch to Lattice
10-16-2006, 04:34 PM
 #8

I begin teaching double digit multiplication using stretch multiplication first because it is easy for the students to see the steps and the place value involved. I then transition into lattice, explaining how the steps of stretch match up with lattice. I then allow the students to choose the method of multiplication they are going to use when solving problems on their own. I know this is probably controversial, but I do not teach the "traditional" method of multiplication until the end of the year after testing. I have found that my students think they have to use it and are not successful in remembering all of the steps. They then get the problems wrong when they could have solved them correctly using lattice or stretch.

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