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 → Time ↓


Understanding A.M. and P.M.


Time is a way of telling and understanding when something is happening. It helps us know when we wake up, go to school, have lunch, and go to bed. In our daily lives, we often say "AM" and "PM" when we talk about time. But what do they mean? Let's look at the world of time in a simple way, focusing specifically on the meaning of AM and PM.

What is the time?

Time is divided into hours, minutes and seconds. There are 24 hours in a day, 60 minutes in an hour and 60 seconds in a minute. When we look at a clock, we usually see the hour and minute hands.

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The hour hand is short and moves slowly around the clock. The minute hand is long and moves fast. In one hour, the minute hand completes one full revolution while the hour hand moves from one number to the next.

What are AM and PM?

AM and PM are used to divide the day into two parts, each of which is 12 hours long. "AM" stands for "Ante Meridiem," a Latin term meaning "before noon," and "PM" stands for "Post Meridiem," which means "after noon."

Morning: Morning

When we say it's AM, we're talking about the time from midnight to just before noon. Here's a simple description of AM time:

  • 12:00 AM - Midnight
  • A new day begins at 1:00 AM
  • 6:00 a.m. - early morning, when most people wake up
  • 9:00 AM - Morning activities begin, like school or work
  • 12:00 PM – exactly noon, where AM ends and PM begins
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The blue hand (minutes) shows the time as 5:00 AM, which is morning.

Afternoon and evening: PM

When we talk about PM, we mean the time from midday to just before midnight. Here's how PM typically spreads during the day:

  • 12:00 PM - Noon
  • 1:00 PM - afternoon time
  • 3:00 pm - mid-afternoon, when some kids may get out of school
  • 6:00 pm - evening, when people eat dinner
  • 9:00 pm - nighttime, when most people go to sleep
  • 11:59 PM - Just before midnight, end of the day
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The blue hand (minutes) shows the time 2:30 pm.

Difference between AM and PM

Although AM and PM divide the day into exactly two parts, they represent different parts of our day. To help you remember:

  • Morning time is when the sun rises and shines in the morning. This is the time when you start your day.
  • PM is the time when the sun goes down and we see the moon and stars. This is the time when you relax and prepare to go to bed.

Examples of AM and PM

To get a more practical understanding of what AM and PM mean, consider these examples:

Example 1: If you wake up at 7:00 AM, you wake up 7:00 AM.

Example 2: If you eat lunch around 1:00 PM, you will eat lunch at 1:00 PM.

Example 3: If you go to bed at 9:00 PM, you go to bed at 9:00 PM

Example 4: If you set your watch's alarm to go off at midnight to watch fireworks, you set it for 12:00 AM.

Reading the clock: Practice

To better identify AM and PM, let's go through some clock faces:

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The clock is showing 2:00. If it is afternoon, we call it 2:00 PM

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The clock shows 10:00. If it is morning, we call it 10:00 AM

Some interesting facts about time

Understanding time can be fun! Here are some interesting facts:

  • There are 86,400 seconds in a day. That's a huge number!
  • The hour was originally divided into 60 minutes because the Babylonians used a base 60 number system.
  • Most people in the world use a 24-hour clock, but in daily life, many people still prefer the 12-hour clock with AM and PM

Practice makes perfect

Practice telling time every day. Look at the clock and try to guess whether it's AM or PM depending on what you're doing:

  • Is the sun shining, are you at school or having breakfast? Let's say it's morning right now
  • Are you looking at the stars, or having dinner with the family? It could be the PM

Conclusion

Recognizing and understanding AM and PM may seem tricky at first, but once you get the hang of it it's pretty simple. Remember, AM stands for morning to afternoon, and PM stands for afternoon to night. With practice, you'll get used to reading the time correctly and know exactly whether you're late or on time for your favorite activities.


Grade 3 → 3.4.4


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Understanding A.M. and P.M.

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