Barbie Bungee: A Maths Investigation

Last week we completed one of my favourite maths investigations. Basically, we tied a string of rubber bands around a Barbie Doll's feet and threw her out of a really tall window . . .

In reality, it's a lot more sophisticated. Barbie Bungee is an investigation which covers a number of mathematical skills and strategies, but with my Year 5s and 6s really served to teach them that a) patterns can be graphed and b) predictions can be made from these graphs.

To complete this investigation the class was broken into four groups (I have 4 Barbie dolls), given a Barbie Doll each and a whole pile of rubber bands which were the same size. We then broke the investigation into steps which were completed over a few days.

Step One: Students learned about the investigation. They practiced tying the rubber bands (one looped around another then pulled through), thought about how they were going to take measurements (grabbing 30cm rulers, 1m rulers and tape measures) and practiced throwing Barbie from various places (important to get this need out of their system) We also talked about the goal - to throw Barbie from the sound box in our school hall, getting her as close to the ground as possible without touching . . .

Step Two: Taking our initial measurements. Students staked out the best spots and dropped Barbie with one rubber band, two rubber bands, three, four and five rubber bands (and so on). They were required to complete three tests at each stage and then find an average (for accuracy) and they had to record their information in a table. This took one to two days. The best thing I saw during this was the use of different measuring methods (sticky taping two measuring tapes together) and creative placed to drop Barbie (out the classroom window).

Step Three: Graphing the results: Students used their results to make a graph (number of rubber bands against distance fallen). They then used this graph with it's almost straight line to predict how many rubber bands they would need.

Step Four: Test Day. We took the students and an audience to the hall and each group had three goes at tossing Barbie from the sound box. The measurements (how close to the ground) were averaged and the closest to the ground won. All in all, very entertaining and a fabulous time. We did a small write up afterwards - what steps did we take, what maths was involved, but nothing too much.

A great investigation.

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Preparing for NAPLAN: The NAPLAN Game Show

NAPLAN (Australia's national testing for Year 3,5,7 and 9) begins on Tuesday, so I took advantage of a clear day yesterday to set up a game show in preparation. The class was broken into 2 teams, with equal numbers of 5s and 6s since the 6s had sport later in the afternoon. All activities corresponded with a section of the NAPLAN test.

Round One: Writing Ideas in 5 minutes. Each group was given the same writing stimulus and had to come up with as many story ideas as possible in 5 minutes. Points given for most ideas and most original ideas.

Round Two: Three parts to one story. There were 12 students in each team, so four of them wrote story beginnings, four wrote story middles and four wrote story endings. Then they had to put them together to make four different stories. They were only allowed 5 minutes to talk to each other before they started. Points for best story and funniest story.

Round Three: Spelling Relay. The NAPLAN spelling test requires students to find the mispelt word in a sentence and fix it. The relay had the students lining up in their teams running forward to one of the two easles and fixing the mispelt word, and running back to the next student. Points for fastest and for each correct word.

Round Four: Kung Fu Puncuation Kung-Fu Off: Students correct a poorly punctuated grammatically incorrect sentence by 'acting out' the sentence using Kung Fu Punctuation (must explain that some time). Points for correct corrections and for style.

Round Five: Team Maths Competition: Students work in a team to complete an old practice test. Points for fastest and for each correct problem.

Round Six: Comprehension Quiz Show: Students read a comprehension text and participate in a quiz show style event.


It was a fabulous day which really relaxed some of the students about taking this test next week and was just, down right fun.