# Orange You Glad You’re Not Round?

Here's your nightly math! Just 5 quick minutes of number fun for kids and parents at home. Read a cool fun fact, followed by math riddles at different levels so everyone can jump in. Your kids will love you for it.

# Orange You Glad You’re Not Round?

April 15, 2018

It’s funny how almost all fruits are round. Apples, oranges, watermelons, kiwis…why is that? Mother Nature may have a few reasons, one being that the fruit can roll away once it falls from the tree, and spread seeds for new trees. But then what about these 5-sided oranges from Japan? Don’t worry — the oranges don’t grow on the tree like that by themselves! The farmer puts a wooden frame around each one as it hangs from the branch. As the orange grows, it squishes itself into the corners and takes that 5-sided shape. The Japanese use this same trick to grow cube-shaped watermelons and other funny-shaped fruit…and none of it will roll off your plate.

Wee ones: Which has more sides, a square watermelon slice (4 sides) or this orange slice (5 sides)?

Little kids: What do you call a shape with 5 straight sides, like we see here?  Bonus: It took the fruit growers 3 years to make this idea work. If they got it working in 2014, when did they start?

Big kids: By making cube-shaped watermelon, the Japanese can fit more pounds of watermelon on a shelf. If you have 4 rows of 6 cube watermelons, how many melons do you have?  Bonus: If you have 20 5-sided orange slices side by side to make a full circle, so each one is touching the 2 it sits between, how many orange edges aren’t touching anything?

The sky’s the limit: If you stack a cube of 5 watermelons across, 5 front to back and 5 tall, how many watermelons are hidden inside, with no faces facing the air or the floor?