What are those giant rolls of brown stuff? They're bales of straw, from a Picture of the Day on Wikimedia. Farm animals like horses and cows sleep on straw, so farms need to gather up a lot of it. Farms also need lots of hay for animals to eat: a horse needs to eat about 20 pounds of hay each day. That might be a quarter or a third of what you weigh! By the way, what's the difference between hay and straw? Hay is alfalfa or grass, while straw is dried-out, leftover wheat stalks. Just like you don't want to eat your pillow, horses don't want to eat straw!
Wee ones: What shape does the front of a bale look like?
Little kids: What 3-D shape is the whole bale? Bonus: How many bales can you count in the field? Which one do you think is closest to the camera?
Big kids: Square bales of hay weighs 50 pounds. If each horse eats 20 pounds, how many horses can you feed enough food with 1 bale? Bonus: How many bales do you need to be able to feed an exact number of horses?
The sky's the limit: If you make a bale with twice as wide a circle (but the same length), it will hold 4 times as much hay. If it's 3 times as wide, it will hold 9 times as much hay. How many times as much hay would a bale 4 times as wide hold?
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