Measurement and units (T4 W10)
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Measurement is a way to quantify the characteristics of objects, such as their length, mass, and capacity. In this lesson, we will focus on three main types of measurement: length (measured in meters, centimeters), mass (measured in kilograms, grams), and capacity (measured in liters, milliliters). Each unit has its own specific use, and it's important to choose the right unit for the context of the problem.
Let's say we want to measure the length of a pencil. If we use a ruler, we might find that the pencil is 15 centimeters long. To convert this to meters, we remember that 1 meter equals 100 centimeters. Therefore, 15 centimeters is equal to 0.15 meters. This conversion is important when we need to compare lengths in different units.
Now, let's practice measuring mass. If we have a bag of flour that weighs 2 kilograms, how many grams does it weigh? Since 1 kilogram equals 1000 grams, we can multiply 2 by 1000. Therefore, 2 kilograms is equal to 2000 grams. Work with your partner to convert the following weights: 3.5 kilograms to grams and 1.2 kilograms to grams.
Now it's your turn to solve some measurement problems on your own. 1) A bottle holds 1.5 liters of juice. How many milliliters is that? 2) A book weighs 300 grams. How many kilograms does it weigh? 3) If a ribbon is 2.5 meters long, how many centimeters is that? Show your working clearly for each problem.
Answer: Centimeters
Centimeters are a unit of measurement used specifically for measuring length.
Answer: 2000 grams
There are 1000 grams in a kilogram, so 2 kilograms equals 2000 grams.
Answer: 1.5 liters
Since 1000 milliliters equals 1 liter, 1500 milliliters is equal to 1.5 liters.
Answer: Kilograms
Kilograms are the appropriate unit for measuring weight.
Answer: 0.2 meters
To convert centimeters to meters, divide by 100. So, 20 cm ÷ 100 = 0.2 m.
Answer: 2000 milliliters
1 liter is equal to 1000 milliliters, so 2 liters equals 2000 milliliters.
Answer: 350 centimeters
To convert meters to centimeters, multiply by 100. So, 3.5 m × 100 = 350 cm.
Answer: Grams
Grams are a unit of measurement used for mass.