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Warm-up

Warm-up. Homework out. 8.3 finding a # when the % is known. 2 ways to solve Write an equation & solve Write a proportion & solve. 36 is 4% of what #?. What would this look like as an equation? 36 = .04x What would this look like as a proportion? 4/100 = 36/x

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Warm-up

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  1. Warm-up Homework out

  2. 8.3 finding a # when the % is known • 2 ways to solve • Write an equation & solve • Write a proportion & solve

  3. 36 is 4% of what #? • What would this look like as an equation? 36 = .04x • What would this look like as a proportion? 4/100 = 36/x • Solve for “x” using the equation or proportion. X = 900

  4. 51 is 6% of what #? • What would this look like as an equation? 51 = .06x • What would this look like as a proportion? 6/100 = 51/x • Solve for “x” using the equation or proportion. X = 850

  5. 3 types of % problems • Finding the % of a # • 15% of 120 = n • Solve • Finding the % when the 1st # is known. • What P% of 120 = 18 • solve • Finding a # when the % is known. • 15% of n = 18 • solve

  6. Word problem • A domestic pig can run about 33 1/3% of the speed of a giraffe. A giraffe can run about 33 miles per hour. To the nearest tenth, how fast can a domestic pig run? Set up an equation & solve N = 33 1/3% (33)

  7. practice

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