Grade 2
  1. Number Sense and Operations  1.1. Counting and Number Sequences  1.1.1. Counting up to 100  1.1.2. Counting by 2s, 5s, and 10s  1.1.3. Counting Backward from 20  1.1.4. Odd and even numbers in counting sequences  1.2. Place Value  1.2.1. Understanding ones and tens  1.2.2. Comparing Two-Digit Numbers  1.2.3. Identifying the Value of Each Digit in a Number  1.2.4. Building numbers using tens and ones  1.3. Addition and Subtraction  1.3.1. Basic addition up to 20  1.3.2. Basic subtraction up to 20  1.3.3. Addition with Regrouping  1.3.4. Subtraction with Borrowing  1.3.5. Solving word problems involving addition and subtraction  1.3.6. Addition and Subtraction with Multiples of 10  1.4. Odd and Even Numbers  1.4.1. Identifying Odd and Even Numbers  1.4.2. Understanding patterns in odd and even numbers  1.4.3. Simple operations with odd and even numbers
  2. Fractions and Decimals  2.1. Introduction to Fractions  2.1.1. Understanding halves and quarters  2.1.2. Representing fractions visually  2.1.3. Simple Fraction Comparisons  2.1.4. Writing Simple Fractions  2.1.5. Fractions as part of a whole  2.2. Fraction Equivalency  2.2.1. Understanding Equal Parts  2.2.2. Identifying Equivalent Fractions
  3. Measurement and Data  3.1. Length Measurement  3.1.1. Measuring objects using rulers  3.1.2. Comparing lengths  3.1.3. Estimating lengths  3.1.4. Understanding units of measurement (centimeters and inches)  3.1.5. Relating Length Measurements to Real-World Objects  3.2. Weight and Mass Measurement  3.2.1. Comparing Weights of Objects  3.2.2. Estimating weight in grams and kilograms  3.2.3. Using balance scales for comparison  3.3. Volume and Capacity Measurement  3.3.1. Understanding capacity with cups and liters  3.3.2. Comparing capacities of containers  3.3.3. Introduction to Milliliters  3.4. Time  3.4.1. Reading analog and digital clocks  3.4.2. Understanding hours and minutes  3.4.3. Calculating elapsed time in hours  3.4.4. Days of the week and months of the year  3.4.5. Understanding AM and PM  3.5. Money  3.5.1. Recognizing coins and bills  3.5.2. Counting money up to $1  3.5.3. Simple Addition and Subtraction with Money  3.5.4. Making Change for a Dollar
  4. Geometry and Spatial Reasoning  4.1. Shapes and Their Attributes  4.1.1. Identifying basic shapes (circle, triangle, square, rectangle)  4.1.2. Understanding sides and corners  4.1.3. Distinguishing between 2D and 3D shapes  4.1.4. Recognizing 3D Shapes (Cube, Sphere, Cone, Cylinder)  4.1.5. Composing and Decomposing Shapes  4.2. Symmetry  4.2.1. Understanding Lines of Symmetry  4.2.2. Drawing Symmetrical Shapes  4.2.3. Identifying Symmetrical Objects in the Environment  4.3. Patterns and Spatial Awareness  4.3.1. Recognizing and Creating Patterns  4.3.2. Extending Patterns  4.3.3. Understanding positions (left, right, above, below)  4.3.4. Using a grid to locate objects
  5. Data Handling and Probability  5.1. Collecting and Organizing Data  5.1.1. Using tally marks  5.1.2. Reading Bar Graphs  5.1.3. Simple Pictographs  5.1.4. Creating Bar Graphs from Given Data  5.2. Interpreting Data  5.2.1. Answering questions based on data  5.2.3. Identifying Most and Least in Data Sets  5.3. Introduction to Probability  5.3.1. Understanding likely and unlikely events

Grade 2 → Measurement and Data ↓


Weight and Mass Measurement


In grade 2 math, we learn about weight and mass. Weight and mass tell us how heavy or light something is. When we measure weight or mass, we can compare things to each other or use a standard unit of measurement to find out how much something weighs.

What is mass?

Mass is the amount of matter in an object. It doesn't change no matter where the object is. For example, if you have a ball, its mass remains the same whether you are at home or at school.

What is the weight?

Weight is a measure of how heavy something is. It depends on the force of gravity. For example, if you were on the moon, things would weigh less because there is less gravity there than on Earth.

Units of measurement of weight and mass

We measure weight and mass using different units. Some of the most common units are:

  • Gram (g): This is a small unit for measuring light objects, such as paper clips or feathers.
  • Kilogram (kg): This is the larger unit for heavier items, like a bag or dog.

Visual example

Suppose you have a small bag of candy and a large watermelon.

Candy watermelon

A bag of candy can weigh around 200 grams, while a watermelon can weigh around 3 kilograms.

How to measure weight and mass

We use scales to measure weight and mass. There are many types of scales such as:

  • Balance scales: These scales show whether two objects weigh the same. You place an object on each side, and if they balance, they weigh the same.
  • Digital scales: These scales tell you the exact weight when you place something on them. They can show both grams and kilograms.

Example of using a balance scale

Imagine that you want to compare the weight of an apple and some toy blocks.

Apple Blocks

If the scale tilts toward the apple, the apple is heavier than the blocks. If it stays level, they weigh the same.

Why is it important to understand weight and mass?

Knowing about weight and mass is helpful in everyday life. Here are some reasons why it's important:

  • Cooking: To make delicious food, we need to measure the ingredients correctly. For this, it is often necessary to know the weight of the ingredients.
  • Buying and Selling: When you buy fruits or vegetables, you pay based on their weight.
  • Safety: Knowing if something is too heavy to lift can help you prevent injury.

Activities to practise measurement

Here are some fun activities you can do at home or in the classroom to get better at measuring weight and mass:

Activity 1: Make a balance scale

You can make a simple balance scale using a hanger and some small containers. Hang two containers from the hanger and place different objects in each container to see which object is heavier.

Activity 2: Find the weight

Use a kitchen or digital scale to measure common household items. Try weighing them first and then see how close you were.

Activity 3: Compare weights

Gather different objects like toys, fruit, and school supplies. First, hold them in both of your hands and compare them. Then use a scale to see if your guess was correct.

Words and vocabulary to remember

Here are some important terms related to weight and mass:

  • Mass: The amount of matter present in an object.
  • Weight: How heavy something is.
  • Gram (g): A small unit of weight.
  • Kilogram (kg): A large unit of weight. 1 kilogram = 1000 grams.
  • Scales: An instrument for measuring weight.
  • Balance: Having equal weight on two sides.

Practice problems

Let's take a look at some practice problems. Try solving them yourself!

  1. If a bag of apples weighs 2 kilograms and a bag of bananas weighs 1 kilogram, which bag is heavier?
  2. Sarah's pencil case weighs 150 grams and her water bottle weighs 300 grams. What will be the combined weight of both objects?
  3. If Tom's book weighs 600 grams and his notebook weighs 200 grams, which book is lighter?

Summary

Learning about weight and mass is a useful skill. Knowing how to measure them and what they mean helps us in many aspects of life, whether shopping or baking a cake. Understanding grams and kilograms and learning how to use scales will make you better at everyday activities.

Keep practicing with different objects and different scales, and soon you'll become an expert at measuring weight and mass!


Grade 2 → 3.2


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Relating Length Measurements to Real-World Objects
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Comparing Weights of Objects

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Weight and Mass Measurement

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