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STANDARDS
CCSS: 3.OA.A.2
TEKS: 3.4H
DIVISION WITH ARRAYS
Kid Inventor Extraordinaire
Lino Marrero has taken shoes to a whole new level
Courtesy of the Marrero Family (Lino Marrero, Chargers); Shutterstock.com (All Other Images)
Lino Marrero was at soccer practice when his cell phone died. He didn’t have a charger, so he couldn’t call his mom to pick him up. He remembered learning about energy in science class and had an idea: What if he could use the energy created while running to power his phone?
Lino researched how to
Lino named his invention Kinetic Kickz. Though he’s still perfecting the idea, people may eventually connect the charger to a phone or another device.
Getting Creative
The shoes were not Lino’s first invention. He started creating when he was just 10 years old. He designed an adjustable band, called the String Ring, to protect musicians’ fingers while playing a stringed instrument called a cello.
Courtesy of the Marrero Family
Lino invented the String Ring when he was 10!
In fact, Lino has a whole notebook of inventions. The pages are full of ideas that could help solve problems. Now 15, Lino won a prize at the Invention Convention last year for his Kinetic Kickz. He hopes it will inspire other kids to invent.
“I think there should be more inventors, especially kids,” he says. “Kids are really creative.”
What to Do
Division is a way of breaking up a set of things into equal parts or groups. One way to represent division is by using a model called an array. By arranging objects into rows and columns, you can more easily see how to create equal groups.
Example
Draw circles around these shoes to show the number of pairs, or sets of 2, there are. Write a division sentence that represents this array.
Shutterstock.com
This array represents the equation 12 ÷ 2 = 6
Now You Try It
Answer the following questions on a separate sheet of paper.
Lino tested 10 different materials for the String Ring, including hair ties and Band-Aids. Each day, Lino tested 2 new materials. How many days did he spend testing? Draw an
Lino is now working on a String Ring for playing the guitar. He will test each material while playing the guitar for 6 minutes. How many materials will he test in 30 minutes?
Before inventing Kinetic Kickz, Lino created the Sole Solution, which are shoes with replaceable soles. Each pair of shoes comes with 3 different soles for different sports. How many Sole Solution packages (shoes plus 3 soles) would be in a shipment with 27 soles?
With Kinetic Kickz, a 12-minute walk will charge a dead phone with enough power to make or receive calls. Draw an array to show how many dead phones could be turned on to make calls after walking for 36 minutes.
