Measurement and units (T1 W6)
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Measurement is a way to quantify the physical world around us. It helps us understand how long, heavy, or full something is. In this lesson, we will focus on three main types of measurement: length, mass, and volume. Length can be measured in meters (m) or centimeters (cm), mass in kilograms (kg) or grams (g), and volume in liters (L) or milliliters (mL). Knowing which unit to use is essential for accurate measurements.
Let's say we want to measure the length of a pencil. If the pencil is 15 cm long, we can write this as 'Length of pencil = 15 cm.' If we have a ruler, we can see that 1 cm is the smallest unit we are using here. If we needed to convert this to meters, we would divide by 100, giving us 0.15 m. This shows how to convert between units of measurement.
Now, let's practice measuring mass. Imagine we have a bag of flour that weighs 2 kg. If we want to know how many grams that is, we can convert kilograms to grams by multiplying by 1000. So, 2 kg = 2 x 1000 g = 2000 g. Let's work together to convert the following weights: 3.5 kg, 1.2 kg, and 0.75 kg into grams. Remember to show your working steps!
For independent practice, solve the following problems on your own. 1. A bottle holds 1.5 L of water. How many mL is that? 2. If a container has a capacity of 250 mL, how many liters is that? 3. You have 3.2 L of juice. How many mL do you have? Show your working clearly for each problem.
Answer: Centimeters
Centimeters are the appropriate unit for measuring small lengths like a pencil.
Answer: 2000 g
There are 1000 grams in a kilogram, so 2 kg equals 2000 grams.
Answer: Liters
Liters are the standard unit for measuring the volume of liquids.
Answer: 1500 mL
To convert liters to milliliters, multiply by 1000. So, 1.5 L x 1000 = 1500 mL.
Answer: 1200 g
1.2 kg is equal to 1200 grams since 1 kg = 1000 g.
Answer: 0.5 L
500 mL is equal to 0.5 liters because 1000 mL = 1 L.
Answer: Gram
Gram is a unit of mass, while the others measure volume, length, and temperature.
Answer: 3000 mL
To convert liters to milliliters, multiply by 1000. Thus, 3 L x 1000 = 3000 mL.