We learned about various units for measuring length, distance, weight, capacity, and time. We saw how different units that measure the same property are related.

Here are the relationships we saw:

• One meter (m) is 100 times as long as 1 centimeter (cm).
• One kilometer (km) is 1,000 times as long as 1 meter (m).
• One kilogram (kg) is 1,000 times as heavy as 1 gram (g).
• One liter (L) is 1,000 times as much as 1 milliliter (mL).
• One pound (lb) is 16 times as heavy as 1 ounce (oz).
• One hour is 60 times as long as 1 minute.
• One minute is 60 times as long as 1 second.

When given a measurement in one unit, we can find the value in another unit by reasoning and writing equations. For example, to express 5 kilograms in grams, we can write . To express 4 pounds in ounces, we can write .

Throughout the section, we used these relationships to convert measurements from one unit to another, to compare and order measurements, and to solve problems in different situations.