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Matter
is what all objects are made of. Mass is the amount of matter in an
object. A gram (g)
and a kilogram (kg)
are metric units of mass.
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Key Facts |
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1,000 grams (g) = 1
kilogram (kg) |
Grams
and
kilograms are metric
units used to measure mass.
A
gram
is used to measure
lighter objects.
A
kilogram
is used to measure heavy objects.
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gram |
kilogram |
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A paper
clip has a mass of about 1 gram. |
A
science book has a mass of about 1 kilogram. |
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 Look at each item below.
Try to image picking up each item. Decide if the mass of each object
is closer to the mass of a paper clip or the mass of a book.
Choose either g or
kg, then check your answer.
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a cookie
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a dog
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a dime |
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a bowling ball
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 To change units, think which unit is heavier. Then think about
how the two units relate.
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3.5 kg =
? g
A gram is less than a kilogram.
To change from kilograms to gram, multiply by 1,000.
Think: 3.5
x 1,000 = 3,500.
Move the decimal 3 places to the right.
So, 3.5 kg
= 3,500 g
To
change to a lesser unit multiply. |
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6,000 g
= ? kg
A kilogram is greater than a gram.
To change grams to kilogram, divide by 1,000.
Think:
6,000 g divided by 1,000.
Move the decimal 3 places to the left.
So, 6,000
g = 6 kg
To
change to a greater unit divide. |
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