Eleven's

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Objective

Students will be able to fluently multiply with 11's.

Big Idea

Good Eleven!

Concept

15 minutes

11 as a factor is both easy and difficult.  There is obviously a pattern with 11's; 11, 22, 33, 44, 55, 66, 77, 88, 99, 110...

But, once we get up to 11 x 11 out pattern somewhat fails us and it is more difficult to recall 11 x 11 and 11 x 12.  So basically, there are two facts that students are going to have to put some memorization into. 

A trick I use with my students for 11 x 11 is that I explain the 2 eleven's take the 2 for a walk.  Hence, the 2 in the middle with a 1 on each side. 

I have included a short video for multiplying by 11.  This is meant to be more of a review and practice instead of a concept introduction.

Practice

30 minutes

Spinner Tool

Students are given one of the spinners to fill out as a reference tool.  The tool will be primarily used during the current level of the multiplication program but should be kept as a reference going forward to higher levels. 

 

Flashcards

There is a set of flashcards provided for the current level.  Each set of flashcards include the facts with their turn-around facts.  It is important that the students are comfortable with the commutative property of multiplication.  

 

Games for Practice

Jumbo Tic-Tac-Toe

  • Each player chooses one factor (2-12)
  • Record the factor in the top of second column
  • Toss 2 dice and find the sum
  • Multiply the sum by the factor
  • Record the product next to the sum in the table
  • If the sum has already been filled, lose a turn
  • First player to complete the table wins

 

Line It Up

  • Toss 2 dice and find the sum
  • Multiply the sum by 2
  • Place a counter on the product
  • If the product has a counter on it, lose a turn
  • First player to build a full row or column wins

 

Face-Off

  • Each player chooses one factor (2-12)
  • Record the factor in the top of second column
  • Toss 2 dice and find the sum
  • Multiply the sum by the factor
  • Record the product next to the sum in the table
  • If the sum has already been filled, lose a turn
  • First player to complete the table wins

Timed Test

15 minutes

There are two timed tests associated with this new factor.  The first timed test is designed to be a one minute test of 40 problems and includes only multiplication facts with the new factor.  The second timed test is designed to be a two minute test of 60 problems and includes all multiplication facts learned in the leveled program thus far.