A lesson on sharing divisions with decimals that have up to 3 decimal digits (and naturally a whole-number divisor). I first use a visual (concrete) model, but actually we can solve many of these by using simple mental math. For example, 0.24 / 6 can be thought of as 24 hundredths shared equally between 6 people -- each person will get 4 hundredths, so the answer is 0.04.
Sometimes, it helps to add a decimal zero to the dividend. For example, to solve 0.4 / 5, write 0.2 as 0.40 first to get 0.40/5. Now, it is 40 hundredths divided by 5 to get 8 hundredths, or 0.08.
These are very simple principles, yet often forgotten in the typical school curriculum. I intend this lesson for 5th grade and onward - whenever students have gained a good basic grasp of decimal place value. It also matches the Common Core Math Standard 5.NBT.7
The second part of this lesson deals with mental math divisions where the divisor itself is a decimal number, and it is found at https://www.youtube.com/watch?v=o4tKip8LcDY
Check out also my free books and worksheets at http://www.mathmammoth.com/free
Tagged under: mental math,sharing division,decimal division,5th grade,math,visual model,5.NBT.7,division
Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.
Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip
Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans
1. Students enter a simple code
2. You play the video
3. The students comment
4. You review and reflect
* Whiteboard required for teacher-paced activities
With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.
Carry out a quickfire formative assessment to see what the whole class is thinking
Create interactive presentations to spark creativity in class
Student teams can create and share collaborative presentations from linked devices
Turn any public video into a live chat with questions and quizzes