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Five-Minute Check (over Lesson 12–2) Main Idea and Vocabulary Key Concept: Metric Units of Mass Example 1: Convert Larger Units to Smaller Units Example 2: Convert Smaller Units to Larger Units Example 3: Compare Mass Lesson Menu
I will convert metric units of mass. gram milligram kilogram Main Idea/Vocabulary
KC 1
Convert Larger Units to Smaller Units Hamsters have a mass of about 45 grams. What is the mass in milligrams? 45 g = mg A gram is a larger unit than a milligram. 45 × 1,000 = 45,000 1 g = 1,000 mg, so multiply 45 by 1,000. Answer: So, 45 g = 45,000 mg. Hamsters have a mass of about 45,000 milligrams. Example 1
Convert 21 kilograms to grams. B C D Example 1
Convert Smaller Units to Larger Units Jill’s dog has a mass of 9,500 grams. What is its mass in kilograms? 9,500 g = kg A gram is a smaller unit than a kilogram. 9,500 ÷ 1,000 = 9.5 1,000 g = 1 kg, so divide 9,500 by 1,000. Answer: So, 9,500 g = 9.5 kg. Jill’s dog has a mass of 9.5 kilograms. Example 2
Convert 17,000 milligrams to grams. B C D Example 2
Compare Mass Raina put birdseed in two feeders. At the end of three days, Feeder A had 56 grams of seeds in it and Feeder B had 46,350 milligrams of seed in it. Which feeder had the most seed in it? Explain. 56 g = mg Convert a larger unit to a smaller unit. 56 × 1,000 = 56,000 1 g = 1,000 mg, so multiply 56 by 1,000. Answer: So, 56 g = 56,000 mg. Feeder A had the most seed in it since 56 g = 56,000 mg and 56,000 mg > 46,350 mg. Example 3
They both weigh the same. Laura is taking two packages to be shipped. Package 1 weighs 75,605 milligrams and Package 2 weighs 81 grams. Which weighs more? package 1 package 2 They both weigh the same. A B C Example 3
End of the Lesson End Lesson
Five-Minute Check (over Lesson 12–2) Image Bank Math Tool Chest Metric Rulers Resources
(over Lesson 12–2) Solve. Determine if the answer is reasonable. Consuela could swim 100 yards in 3 minutes. At that rate, she estimated that she could swim 1 mile in 20 minutes. Is her estimate reasonable? Why or why not? Five Minute Check 1
(over Lesson 12–2) A. Yes; 1 mile equals 2,760 yards. 2,760 ÷ 100 = 27.6 one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be 27.60 × 3 min = about 82.8 minutes. B. Yes; 1 mile equals 1,760 yards. 1,760 ÷ 100 = 17.60 one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be 17.60 × 3 min = about 53 minutes. C. No; 1 mile equals 1,760 yards. 1,760 ÷ 100 yds = 17.60 one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be 17.60 × 3 min = about 53 minutes. A B C D D. No; 1 mile equals 2,760 yards. 2,760 ÷ 100 = 27.6 one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be 27.60 × 3 min = about 82.8 minutes. Five Minute Check 1
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