## Measuring to fractions of an inch and making line plots

It was a busy week!  I finally got to tackle one of the new common core standards for grade 4 that I have been waiting to sink my teeth into!

• CCSS.Math.Content.4.MD.B.4 Make a line plot to display a data set of measurements in fractions of a unit (1/2, 1/4, 1/8). Solve problems involving addition and subtraction of fractions by using information presented in line plots. For example, from a line plot find and interpret the difference in length between the longest and shortest specimens in an insect collection.
That's it.  That is the represent and interpret data standard for grade 4.  Big change for me.  I used to do an entire unit on representing and interpreting data.  I love that this standard is so focused.  I love that it connects directly to fractions.  In fact it really is a fraction number line!!!!

So... here is how I addressed this standard with my fourth graders

We measured pencils to the nearest quarter inch (I know the standard wants 1/8ths but we were not there yet) I divided the class into 4 groups, gave each group a pile of pencils a bunch of rulers and some scrap paper.  They were told to measure their pencils to the nearest quarter inch and record their results.  Here is one groups results

Several groups got really into making sure they were putting the measurements in numerical order and ended up arranging their pencils from smallest to largest before beginning.

I drew a line plot on the white board and as the groups finished, they came to the board and plotted their results
Here is what it looked like when it was done!  Each group decided to use a different color.

Here is where the fun began!
We gathered around and I started asking questions, focusing on interpreting line plots, fraction equality, scale, and fraction addition and subtraction.  Here is a sampling of some of the questions

Why did I chose to start and end the number line where I did?
What do the small marks between the numbers mean?
What is the most common pencil length?
How many pencils did we measure?
How much longer is the longest pencil than the shortest pencil?
If I put the three shortest pencils end to end, how long would that be?

This led to a GREAT discussion.  I can see lots of applications to this in science class.  We MIGHT do this again and measure something to the nearest 1/8 of an inch but we will probably try to tag team this lesson with science class and make a line plot of measurements and data that are important for scientific purposes.  We shall see

Two more pictures

How do you plan on addressing this new data standard?

To read more about how I took this lesson to the next level, click here to check out my guest post on Minds in Bloom about taking this standard to the nearest eighth of an inch.

1. Great idea! Pencils are something that is readily available in every classroom. The cool thing is if you did this once a week you would get different results.
Brooke
Tales from a Fourth Grade MathNut

1. Hi Brooke,
This is a great lesson and so easy to do because everything you need is available in the classroom. No prep work required. Your blog name intrigues me, can't wait to check it out!

Tara

2. Love that you made the line plot look like a ruler! Much easier for kids to transfer the idea. Will definitely do this at the beginning of our 5th grade study on this.

Liz
Beach Teach

1. It is a great lesson for fifth grade! There were so many connections being made between fractions and rulers are measurement it was amazing. Good luck!

3. Love this...and I cannot wait to try it. In fact since there is no prep, I can do it at any time!

1. You really can do this lesson anytime! I love no prep days