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STANDARDS
CCSS: 7.EE.B.4.A
TEKS: 7.5C, 6.5A
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2 Truths + 1 Lie
Dave Killen/The Oregonian
Every fall, travelers on Oregon’s Highway 18 are in for a happy treat: a smiley face made of trees! A lumber company planted this mix of larches and evergreen Douglas firs in 2011.
When autumn comes, the larch needles turn golden yellow, while the firs stay green—and a giant golden yellow smile emerges from the hills! Here are three statements about the all-natural smiley face . . . but one is a lie! Can you use what you know about unit rates to find the lie? Record your work and answers on the online skill sheet/answer sheet.
Douglas fir trees grow about 2 feet per year, so the green trees have grown 28 feet!
Truth or Lie?
The diameter is about 300 feet. They planted the trees 12 feet apart, so there’s fewer than 23 trees across the diameter.
Larch trees grow to 200 feet tall at a rate of 18 inches per year. A sapling was 15 inches tall at planting. So it will take 132.5 years to reach its full height.