In order to build understanding of multiplying by 8 students need to be comfortable with their 4's and the concept of doubling. 8's are just 4's doubled.
For example, 8 x 5 is the same as 4 x 5 and 4 x 5 or 20 + 20. This will be difficult for students who lack an understanding of doubling and mastery of their products using 4 as a factor.
I have included a short video for multiplying by 8. This is meant to be more of a review and practice instead of a concept introduction.
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
Line It Up
Face-Off
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.