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.
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.
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
Line It Up
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.