One of my most searched for and read posts is my foldable for divisibilty rules. The foldable was just a flap book that I had students write the rules under the flaps. I decided that since it was such a big hit, that I needed to “outdo” that post this year.
This year, I used the same fold as my “Back to School Foldable.” I made a printable for the different numbers that I wanted the students to know the rules over. I totally meant to print these out on colored paper for my students. I even took the colored paper down to the copy machine, and completely forgot to put the paper in the machine. For my class, I used the numbers; 2, 3, 4, 5, 6, 9, and 10.
Here are the following rules I used for each of the numbers:
A number is divisible by 2 if: it is even. If it ends with 0, 2, 4, 6, 8
A number is divisible by 3 if: the sum of its digits is divisible by 3
A number is divisible by 4 if: the number formed by the last two digits is divisible by 4
A number is divisible by 5 if: it ends with 0 or 5
A number is divisible by 6 if: it is divisible by 2 and 3
A number is divisible by 9 if: the sum of the digits is divisible by 9
A number is divisible by 10 if: it ends with 0
Click on the picture below to download the free foldable template.
This is a little bit of a tricky fold. I have a great “Back to School” post in which I have a video that explains how to fold it, and it also includes pictures of each step. Click here for a link to that post.
We went through each of these divisibility rules together and gave examples. After we finished, we taped the foldable to the bottom of a page in their math spiral notebooks. We titled the page “Divisibility Rules.”
To give my students practice, I put the students in groups of two. I gave them three ten-sided die per group. I had them take turns rolling the dice to form a three digit number. After they got the number, they went through each of the divisibility rules and circled which of those that number was divisible by. Here is an example of their spiral notebook page.