Tools and Units for Mass Lesson Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone

Metric Units of Mass

 Mass is the amount of matter that makes up an object.  Gram (g) is a metric unit used to measure the mass of small objects.  Kilogram (kg) is equal to 1,000 grams, so it is used to measure the mass of larger objects.

 A paperclip has a mass of about 1 gram A book has a mass of about 1 kilogram

 Metric Units of Mass Name Abbreviation Number of Base Units Approximate Comparison Gram g 1 mass of a small grape Kilogram kg 1,000 mass of a cantaloupe

 Conversions The chart above shows the relationships between the units of grams and kilograms. You can use the chart to change a measurement from one unit to another unit. How many grams are in a 3 kilograms? You can change from kilograms to grams by multiplying. 3 kg=  ___ g Think: 1 kg = 1000 g 3 x 1000 = 3000 3 kg = 3000 grams How many grams are in 5,000 kg? You can change from grams to kilograms by dividing. 5000 g = ___ kg Think: 1000 g = 1 kg 5000 divided by 1000 = 5 5000 g = 5 kg

 Remember: To measure an object that has a small mass, use grams.  To measure an object that has a larger mass, use kilograms.

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