Grade 3
  1. Number Sense and Numeration  1.1. Understanding Numbers  1.1.1. Reading and Writing Numbers up to 10,000  1.1.2. Place Value up to Thousands  1.1.3. Comparing and Ordering Numbers  1.1.4. Rounding Numbers to the Nearest Ten and Hundred  1.1.5. Skip Counting by 2s, 5s, 10s, and 100s up to 1,000  1.2. Operations with Whole Numbers  1.2.1. Addition and Subtraction up to 1,000  1.2.2. Multiplication Facts (up to 10 x 10)  1.2.3. Division Facts (up to 100)  1.2.4. Multiplication as Repeated Addition  1.2.5. Division as Equal Sharing  1.2.6. Word Problems with Addition, Subtraction, Multiplication, and Division  1.3. Estimation  1.3.1. Estimating Sums and Differences  1.3.2. Estimating Products and Quotients  1.4. Understanding Even and Odd Numbers
  2. Fractions and Decimals  2.1. Understanding Fractions  2.1.1. Identifying and Representing Fractions  2.1.2. Fractions of a Whole and Part of a Set  2.1.3. Comparing and Ordering Fractions with Like Denominators  2.1.4. Equivalent Fractions  2.1.5. Simple Fraction Word Problems  2.2. Introduction to Decimals  2.2.1. Tenths and Hundredths as Decimals  2.2.2. Relationship between Fractions and Decimals
  3. Measurement  3.1. Length  3.1.1. Measuring in Centimeters and Meters  3.1.2. Comparing and Ordering Lengths  3.1.3. Estimating Lengths  3.1.4. Converting Between Centimeters and Meters  3.2. Mass  3.2.1. Measuring in Grams and Kilograms  3.2.2. Estimating and Comparing Mass  3.3. Capacity  3.3.1. Measuring in Milliliters and Liters  3.3.2. Estimating and Comparing Capacity  3.4. Time  3.4.1. Telling Time to the Nearest Minute  3.4.2. Calculating Elapsed Time  3.4.3. Using a Calendar  3.4.4. Understanding A.M. and P.M.  3.5. Area and Perimeter  3.5.1. Calculating Perimeter of Simple Shapes  3.5.2. Estimating and Measuring Area of Shapes  3.5.3. Finding Area by Counting Squares
  4. Geometry  4.1. Properties of Shapes  4.1.1. Identifying 2D Shapes (Triangles, Quadrilaterals, Circles, etc.)  4.1.2. Identifying 3D Shapes (Cubes, Spheres, Cylinders, etc.)  4.1.3. Describing Attributes of 2D and 3D Shapes  4.1.4. Recognizing Parallel and Perpendicular Lines  4.2. Symmetry and Transformations  4.2.1. Recognizing Lines of Symmetry  4.2.2. Identifying Flips, Slides, and Turns  4.3. Angles  4.3.1. Understanding Right Angles  4.3.2. Comparing Angles (Acute, Right, Obtuse)
  5. Data Management and Probability  5.1. Data Collection and Organization  5.1.1. Collecting Data using Surveys and Experiments  5.1.2. Organizing Data using Tally Charts and Tables  5.2.1. Creating and Interpreting Pictographs  5.2.2. Creating and Interpreting Bar Graphs  5.2.3. Reading Simple Line Graphs  5.3. Probability  5.3.1. Understanding Basic Probability Terms (Certain, Possible, Impossible)  5.3.2. Predicting Outcomes  5.3.3. Simple Probability Experiments
  6. Patterns and Algebra  6.1. Patterns  6.1.1. Identifying and Extending Numeric Patterns  6.1.2. Identifying and Extending Shape Patterns  6.1.3. Creating Patterns Using Rules  6.2. Introduction to Algebra  6.2.1. Understanding Variables as Unknowns  6.2.2. Solving Simple Addition and Subtraction Equations  6.2.3. Using Patterns to Solve Problems
  7. Problem-Solving Skills  7.1. Strategies for Problem-Solving  7.1.1. Using Pictures or Diagrams  7.1.2. Identifying Patterns in Problems  7.1.3. Making Organized Lists  7.1.4. Guessing and Checking  7.1.5. Using Logical Reasoning  7.1.6. Breaking Down Problems into Steps

Grade 3 → Measurement ↓


Mass


Mass is a concept that can seem a little tricky at first glance, but once you start to understand it it becomes much easier. Imagine that you have a lot of different objects in front of you. These can be toys, books, fruits, or stones. Have you ever wondered how heavy each of these objects is? That's what measuring mass helps you find out. When we talk about mass in math, especially in third grade, we are talking about how much stuff is inside an object.

What is mass?

Mass is a way to measure how heavy an object is. It tells us how much matter or "stuff" is inside an object. The more matter, the heavier the object. Mass and weight are not the same thing, although they are related. We will use simple terms here to understand mass.

Units of mass

When we measure mass, we use units. There are different units for measuring mass. The most common units are:

  • Gram (g)
  • Kilogram (kg)

1 kilogram (kg) is equal to 1000 grams (g). Grams and kilograms are used around the world to measure mass. We use grams for light objects, such as pencils, apples or chocolate bars. For heavy objects, such as a person, a dog or a sack of rice, we use kilograms.

Example 1

Suppose you have a chocolate bar weighing 50 grams. It is expressed like this:

50 g

Example 2

A large bag of rice may weigh 5 kilograms. It is expressed like this:

5 kg

Visualization of mass

Sometimes visual examples can help us understand better.

Pencil - 5 grams Apples - 200 grams Dog – 10 kg

How to measure mass?

To measure mass, we usually use a balance or a scale. The scale shows us numbers indicating the mass in grams or kilograms.

Mass comparison

Now, let's compare the mass of different objects. By comparing the mass we can know which object is heavier or lighter. This helps in everyday life, such as carrying things from one place to another.

Example 3

Imagine you have an orange weighing 150 g and a watermelon weighing 2 kg. Which of these is heavier?

  • First, remember that 2 kilograms is equal to 2000 grams.
  • Now compare: 2000 grams (watermelon) is more than 150 grams (orange).
  • This means that the watermelon is heavy.

So, the orange is lighter than the watermelon. You can also express this comparison like this:

150 g < 2000 g

Estimating the mass

Sometimes, you need to estimate or guess the mass of an object because you don't have a scale to measure it. Estimating means making a good guess. Based on your past experiences, you can tell if something is heavy or light without measuring it.

Example 4

If you've ever picked up an apple before, you know it's not very heavy. Now, if you look at a ball of the same size, you can guess that it might weigh a little more or less than the apple.

Practicing with the mass

The best way to become a pro at measuring mass is to practice with real objects. Gather a few items you have in your house, such as a spoon, a book, and a bag of sugar. Then, use a kitchen scale to measure how many grams or kilograms they are.

Action

  1. Choose 5 different items from your home.
  2. Guess who is the heaviest and who is the lightest.
  3. Use a kitchen scale to weigh each item.
  4. Write the weight in grams or kilograms.
  5. Compare your previous estimate to the actual measurement.

Practice problems

Problem 1

A banana weighs 120 grams and a potato weighs 150 grams. Which of these is heavier?

150 g > 120 g

Problem 2

You have three things: a toy car (300 g), a notebook (200 g), and an eraser (50 g). Arrange them from heaviest to lightest.

Toy Car - 300 g, Notebook - 200 g, Eraser - 50 g

Problem 3

An elephant weighs approximately 5000 kilograms. Convert this into grams.

5000 kg = 5000 * 1000 = 5000000 g

Measuring, comparing, and even estimating the mass of objects will improve your understanding and help you in everyday life. Keep practicing and you'll become more confident with mass!


Grade 3 → 3.2


U
username
0%
completed in Grade 3

← Prev (3.1.4)
Converting Between Centimeters and Meters
Next (3.2.1) →
Measuring in Grams and Kilograms

Comments 



Mass

https://www.buddymath.com/g3/3.2?bmal=en