Measurement and units (T2 W4)
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Measurement is the process of determining the size, length, or amount of something. In mathematics, we commonly use units such as meters for length, kilograms for mass, and liters for volume. It is essential to choose the appropriate unit based on what we are measuring. For example, we measure the length of a pencil in centimeters, while we measure the weight of a bag of flour in kilograms.
Let's convert 1500 milliliters to liters. We know that 1 liter is equal to 1000 milliliters. To convert, we divide 1500 by 1000. So, 1500 milliliters is equal to 1.5 liters. This conversion is useful when we need to measure larger quantities of liquids.
Using a ruler, measure the length of your desk in centimeters. Record your measurement. Next, convert your measurement to meters. Remember, 1 meter equals 100 centimeters. If your desk measures 120 centimeters, then it is 1.2 meters long. Discuss your findings with a partner and compare measurements.
Solve the following problems independently: 1. A bottle holds 2 liters of juice. How many milliliters is that? 2. If a book weighs 300 grams, how many kilograms does it weigh? 3. Convert 5 meters to centimeters. Show your working clearly for each problem.
Answer: Centimeters
Centimeters are the appropriate unit for measuring small lengths like that of a pencil.
Answer: 3000 mL
There are 1000 milliliters in a liter, so 3 liters equals 3000 milliliters.
Answer: 2.5 kg
To convert grams to kilograms, divide by 1000. Thus, 2500 grams is 2.5 kilograms.
Answer: Liter
Liter is the standard unit of measurement for volume.
Answer: 1.5 liters
Since 1 liter equals 1000 mL, 1500 mL is 1.5 liters.
Answer: 100 cm
1 meter is equal to 100 centimeters.
Answer: Kilograms
Kilograms are used to measure weight, making them suitable for measuring a cat.
Answer: 4500 mL
To convert liters to milliliters, multiply by 1000. Thus, 4.5 liters equals 4500 milliliters.