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Using the Metric System

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liuz
11 diapositives · 283 Views · Jul 22, 2014

This resource from Braintree High School helps students identify appropriate metric units for measuring various quantities such as height, mass, and capacity. It provides real-life examples, like measuring the height of a chalkboard in meters or the mass of textbooks in kilograms. The guide emphasizes choosing the right unit for each measurement, such as using centimeters for broom lengths or grams for candy bars. Additionally, it explores conversion between different metric units, clarifying how to multiply or divide by powers of ten for correct units, enhancing students' measurement skills in practical contexts.

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Using the Metric System
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  1. Using the Metric System Braintree High School

  2. Identifying Appropriate Metric Measures

  3. Choose an appropriate metric unit. • Height of a classroom chalkboard? • Meter; the height of a chalkboard is about twice the distance from the floor to the doorknob. • Mass of a backpack filled with books? • Kilogram; a backpack with textbooks is many times the mass of our math book. • Capacity of a birdbath? • Liter; several quart bottles of water will fill a birdbath.

  4. Choose an appropriate metric unit. • Length of a broom. • Centimeter. Meter could work but 2 meters is overkill for a broom. So centimeters will give us a more accurate measurement. • Mass of an candy bar. • Grams. A candy bar has a mass of several grams but is much less than 1 kilogram. • Mass of a horse. • Kilograms. A horse is very heavy, so grams are too small. • Capacity of a car’s gas tank. • Liter. A gas tank holds several liters, so milliliters are too small.

  5. Choose a reasonable estimate. Explain. • Capacity of a juice box: 200 mL or 200 L? • 200 mL: juice boxes hold less than a quart of milk. • Length of a new pencil: 15 cm or 15 m? • 15 cm: the length of a pencil would be about 15 widths of a thumbnail. • Mass of a small tube of toothpaste: 100 g or 100 kg? • 100 g: the mass is about the same as a box of paper clips.

  6. Choose a reasonable estimate. Explain. • The distance between two cities: 50 mm or 50 km? • 50 km, because a km is about one half of a mile. • Amount of liquid that an eyedropper holds: 10 mL or 10 L? • 10 mL, 10 liters is what a gasoline tank would hold, 10 mL is only a few drops.

  7. Converting Units • Metric system uses a decimal system to relate different units to each other. • You can convert from one unit to another by multiplying or dividing by 10, 100, 1000, and so on. • Names of units work on PREFIXES.

  8. Write in each unit with its prefix.

  9. Going From One Unit To Another • To convert from one unit to another in the metric system, find the relationship between the two units. • Is it length? Capacity (or volume)? Mass (weight)? • Multiply if you’re going from a large unit to small unit. There will be more smaller units than bigger units. • Divide if you’re going from a small unit to a large unit. There will be less bigger units than smaller units.

  10. So lets try it… • 4.35 L = ___ mL 4.35 L • 1,000 = 4,350 4.35 L = 4,350 mL • 914 cm = ___ m 914 cm  100 = 9.14 914 cm = 9.14 m

  11. Complete each statement. • 35 mL = ___ L 35 mL  1000 = 0.035 35 mL = 0.035 L • ___ g = 250 kg ___ g = 250 kg • 1000 250,000 g = 250 kg • ___ cm = 68 m ___ cm = 68 m • 100 6,800 cm = 68 m