


Mathematics Skill or Topic Area: Fraction Operations 

Next Gen Science Standards: ESS2: Earth’s Systems; ETS2: Links Among Engineering, Technology, Science, and Society; LS2: Ecosystems: Interactions, Energy, and Dynamics Common Core ELA for Science: RST.68.2. Determine the central ideas or conclusions of a text; provide an accurate summary of the text distinct from prior knowledge or opinions. RST.68.8. Distinguish among facts, reasoned judgment based on research findings, and speculation in a text. RST.68.9. Compare and contrast the information gained from experiments, simulations, video, or multimedia sources with that gained from reading a text on the same topic. Common Core Math Standard: CC.6.NS.1: Interpret and compute quotients of fractions, and solve word problems involving division of fractions by fractions. 

Video Engagement: NASA and the Chesapeake Bay Learn how NASA uses Earth observing satellites to monitor conditions in the Chesapeake Bay over time. Information about pollution, eutrophication, land cover and watershed runoff helps water managers enact policies to improve the health of the Bay (8 minutes). View Program 


Explore math connections with SpaceMath@NASA 

Problem I  Estimating Land Use from Space using Landsat  Across the entire Chesapeake Watershed, 2/7 of the land area is forested, 1/2 is wetlands, and 1/10 is cultivated. How much of the land area is in the fourth category of 'developed'? [Answer: Add up the fractions to get (1/2+2/7) = 11/14 ,add this to 1/10 to get 31/35, then subtract from 35/35 to get the answer that 4/35 of the land area is developed.] Problem II  Land Use in the Cub Run Watershed in Northern Virginia  Students explore how development and deforestation alter the way in which land is used over time. They investigate the Cub Run Watershed in Northern Virginia using data spanning 1990  2000. Students use fractions to estimate changes in forestation during this 10year period. [Open PDF] Explain your thinking: Write your own problem  Using information found in the Math Connection problems, the press release or the video program, create your own math problem. Explain why you set the problem up this way, and how you might find its answer. Evaluate your understanding: Challenge Problem  If the forested area in the Chesapeake Watershed began with 94,000 square kilometers in 1990 and decreased by 1/90 every 10 years, how long will it take before the amount of forested area has been reduced to 1/2 of its original area in 1990? Answer: We need to reduce the current value by 1/2 so we need to find how many times 1/90 goes into 1/2. The answer is 45 times since 45 x (1/90) = 1/2. Then we need 45 decades or 450 years to reduce the forested area by 1/2.


NASA / JPL 3D Solar System 

Extend your new knowledge  Visit our own Earth using the EOSS simulator and explore Landsat's orbit. [ Open PDF ] 
