Educational Songs with Free Worksheets

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Circumference (It Just Makes Sense)

An engaging rap song for teaching circumference (2 x pi x r) to students. Includes fun worksheets and multiple versions of the song to assist with scaffolding.

Contains: 4 versions of the song, PDF worksheets, and answer keys. Price: $3.99

This song teaches the formula for the circumference of a circle using pi and the radius. It introduces many examples of circular objects where the formula could be used including a clock, car rims, or a jar. "Circumference (It Just Makes Sense)" also explain what the diameter and radius are and how to measure both variables. There are teaching materials, including worksheets, activities and games, to assist teachers and homeschool parents in creating lesson plans for the song topic. Students will have a better understanding of how to find the circumference of a circle using the formula 2 x pi x r.

This math song is suitable for teaching the circumference formula to elementary school 4th grade, 5th grade and 6th grade), middle school, high school, and home school students (4th grade, 5th grade and 6th grade), middle school, high school, home school, and college classes.
If I need to measure up a clock (circumference)
Measure the post on a dock (circumference)
If I’m buying rims for a car (circumference)
Hey, yo, 2πr! (It just makes sense)
If I need to measure up a hat (circumference)
Spinnin’ records like that (circumference)
If I need to pick the right jar (circumference)
Hey, yo, 2πr! (It just makes sense)

Verse I
Check out and see all the round things you can find
So many circles out there, it will blow your mind
It can be hard to measure distance around
But once you use a little math you can figure it out
If you need to find the distance around a circle shape
All you need is one formula and a measuring tape
Then you measure up the radius so you can figure out
‘Cause twice that radius times π is what a circle’s all about


Verse II
You know that every circle—if it’s big or little—
Has one single point that’s right in the middle
So you start on one edge, draw a straight line
Right through the center and to the other side
That’s the diameter. And half of that is the radius
That’s the crucial number that we need to figure this out
Then we multiply it by 2π
Circumference, 2πr, there’s no need to ask why

Resources & Reading

Mrs. Glosser’s Math Goodies
Explains circumference and how to calculate it. Clear, attractive and easy to understand. Practice problems provided.
Grades 4-8

Lesson Plans & Activities

Math Forum
Circling Around
By actually measuring various round objects, students enhance their understanding of circumference. Simple classroom exercise.
Grades 3-6

Education World
As Easy As Pi!
Students conduct a scavenger hunt at home to find circular objects, then use and explain pi and the formula for circumference. Quite thorough.
Grades 4-8

Plan a Pi Day Party for March 14th
Over two dozen activity ideas for celebrating Pi. Site is packed with ideas that are useful, entertaining and educational.
Grades 3-8

Mrs. G
losser’s Math Goodies
Circumference and Area
Links to several circumference activities. Clear, easy to understand. Interesting activities.
Grades 4-8

The Teacher’s Corner
Floor Circles
Activity uses designs on the classroom floor, to help students understand circumference. Excellent visual exercise. Especially good as introduction or for younger students.
Grades 3-6

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