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AKS: 4MA.D.6 measure time and objects that exist in the world to solve real-life, mathematical problems and analyze graphical displays of data to answer relevant questions (4.MDR.6).
Learning Targets: I understand the relative size of measurement units within the metric system.
I can solve multistep problems involving metric units.
Activating Strategy
Activating Strategy
Make a 4-square page in our math journals to answer Warm-Up questions using SLIDE 96.
Mini-Lesson
Mini-Lesson
Yesterday, we learned about liquid measurement, called volume or capacity in metric units called liters and milliliters.
Today, we will continue using metric measurements for mass, called grams and kilograms. Metric mass uses grams (g) and kilograms (kg) for its units. Grams are used for smaller items such as paper clips or pencils. A kilogram is used for more oversized items such as a textbook, a lawnmower, or a horse. A kilogram is about 2 pounds. A kilo means a thousand, so a kilogram is 1,000 grams.
Watch a learning video:
We have learned how to measure length to the half, fourth, and eighth inch and explored metric units of liquid volume.
Today, we will continue learning about metric units of measurement, specifically metric units of mass. The metric units of mass that 4th graders learn are grams and kilograms. We will also solve problems involving metric mass units.
Listen as I think aloud...
The United States uses customary units to weigh objects. Customary units of weight are ounces, pounds, and tons. You may have heard of these units daily, like at the doctor's office or the grocery store. Other countries in the world use metric units to measure mass. Today, we will explore metric mass to learn about the relative size of metric units used to measure mass. The metric units for mass we will explore in 4th grade are grams and kilograms.
Let’s start by looking at household objects that will help us learn about the relative size of grams and kilograms.
Grams: Grams are the metric units we use to measure very light objects.
Kilograms: We use units when measuring items with a larger mass. There are 1,000 grams in one kilogram. Let’s look at some items with a mass of about 1 kilogram.
Grams are abbreviated as “g,” and kilograms are “kg.”
“Kilo” means 1,000, so a kilogram technically means 1,000 grams.
Guided Practice
Guided Practice
Let's try one together:
Mathematicians, now that we understand the relative size of metric mass units, let’s look at this problem.
It is suggested that a 4th-grade student’s backpack should hold no more than 9 kilograms. If Jose puts a textbook in his backpack that weighs 2 3/10 kg, a laptop in his backpack that weighs 1 5/10 kg, and a water bottle in his backpack that weighs 1 kg, how many more kilograms can his backpack hold?
When working with metric units of mass, remember that we measure light objects using grams and heavier objects using kilograms. Kilo means 1,000, so 1 kilogram is equal to 1,000 grams.
Practice in small groups: It takes 1,000 milligrams to be the same mass as 1 gram. A milligram would be 1/1,000 less than the mass of a paper clip.
Milligrams are typically used to measure prescription medicines. For example, a capsule of medicine could weigh 250mg or 500mg. Milligrams are also commonly found on the nutritional label of food items, for example, 50 mg of sodium.
BONUS Small Group Practice:
Independent Task
Independent Task
1. FRECKLE - Complete THREE Freckle Assignments each week. DUE FRIDAY. Your HIGHEST score in Targeted Practice is your weekly math grade - Click HERE for Freckle website
GRADED Targeted Practice - Current skill (5 questions; Score Goal=80% or higher)
Fact Practice - Multiplication Fact Practice
Adaptive Practice - At YOUR level
2. iREADY Math - Complete 30 minutes at your level each week
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