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Salt: Math Lesson: Activity 1 of 3

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Table salt is a compound of the two chemical elements sodium and chlorine. If you want to keep track of the amount of sodium you eat every day, you’ll need a way to measure it. Sodium in food is measured in milligrams (mg), a metric unit that measures mass.

“Milli” means “one thousandth,” or 1/1,000, so milligram means 1/1,000 of a gram. A gram (g) is about the weight of a small paper clip. If you broke that paperclip into 1,000 pieces, each piece would weigh 1 mg. In math terms this means:

1 mg = 1/1,000 gram (1 mg is 1/1,000 of a gram.)
Which is the same thing as:
1,000 mg = 1 g (There are 1,000 mg in 1 gram.)

To convert grams to milligrams: multiply the number of grams by 1000.

To convert milligrams to grams: divide the number of milligrams by 1000.

Drag and drop each milligram (mg) measurement to the matching gram (g) measurement.

100 mg
300 mg
1,000 mg
3,000 mg
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