In this short guide you will be able to preview the segment. You’ll also get some great ideas for in-class activities after watching the video with your students.
Here is a creative and fun in-class activity for before/after watching the video…
G U A R A N T E E !
This activity will show your students the beauty of math and patterns.
Tell your students that you can predict if a number divided by 3 will have a remainder or not, without a calculator!
What to do
Ask a volunteer to write a zip code on the blackboard.
Before the volunteer finishes writing the number you will announce if it can be divided by 3 with or without a remainder.
If the number has a remainder, you can ask the volunteer to add another digit so that the new number can be divided by 3 with no remainder.
Ask your students to check on their calculators to see if you were correct.
Let them practice this Math-Magic game working in pairs. It’s a great way to sharpen their mental math in a fun way!
How it Works
✅ Let’s say the volunteer wrote 21657.
✅ When you are adding the digits, you get the sum of 21 which is divisible by 3 with no remainder. If you can divide the sum of the digits by 3 with no remainder, the original number (21657) can also be divided by 3 with no remainder.
✅ And here is something even more exciting – mix the order of the digits and you will see that all the combinations will divide by 3 with no remainder as well!
✅ Now, in case your volunteer chooses, for example, the number 75122, when you add the digits and get 17, you know that there is a remainder when you divide that number by 3. Since 18 divides by 3, and 17 is one digit short you can offer to add 1 to the number to obtain 751221. This new number is now divisible by 3 with no remainder!
Isn’t that awesome?!
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