1. Splash Screen

2. 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

3. I will convert metric units of mass.
gram
milligram
kilogram
Main Idea/Vocabulary

4. KC 1

5. 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

6. Convert 21 kilograms to grams.B C D
Example 1

7. 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

8. Convert 17,000 milligrams to grams.B C D
Example 2

9. 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

10. 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

11. End of the Lesson
End Lesson

12. Five-Minute Check (over Lesson 12–2) Image Bank Math Tool Chest
Metric Rulers
Resources

13. (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

14. (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 × 3 min = about 82.8 minutes.
B. Yes; 1 mile equals 1,760 yards. 1,760 ÷ 100 = one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be × 3 min = about 53 minutes.
C. No; 1 mile equals 1,760 yards. 1,760 ÷ 100 yds = one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be × 3 min = about 53 minutes. A B C D
D. No; 1 mile equals 2,760 yards. 2,760 ÷ 100 = one hundred yard lengths. Since each length takes 3 minutes to swim, the total time would be × 3 min = about 82.8 minutes.
Five Minute Check 1

15. End of Custom Shows