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.
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.