Grade 2
The Human Knowledge Project
Unit 8 — Measurement, Time, and Money
Welcome back!
Mathematics helps us every day.
We use it to measure length, tell time, count money, and solve everyday problems.
Today we will explore some of the most useful parts of mathematics.
Measuring Length
Measurement tells us how long, tall, or wide something is.
We measure many things, including:
- pencils
- books
- tables
- trees
- roads
Common units of length include:
- inches
- feet
- yards
- centimeters
- meters
Choosing the right unit helps us describe objects accurately.
Measuring Weight
Some objects are light.
Some are heavy.
We measure weight using units such as:
- ounces
- pounds
- grams
- kilograms
A feather weighs much less than a backpack full of books.
Measuring Capacity
Capacity tells us how much a container can hold.
We measure:
- water
- milk
- juice
- soup
Common units include:
- cups
- pints
- quarts
- gallons
- liters
Different containers hold different amounts.
Telling Time
Clocks help us organize our day.
An analog clock has:
- an hour hand
- a minute hand
A digital clock shows the time using numbers.
Examples:
7:30
2:15
12:45
Knowing how to tell time helps us arrive on time and plan our activities.
Understanding Money
Money helps us buy and sell things.
Coins include:
- penny (1¢)
- nickel (5¢)
- dime (10¢)
- quarter (25¢)
Paper money is worth larger amounts.
Counting money helps us make good decisions when buying things.
Solving Everyday Problems
Mathematics helps us answer questions like:
- How much does this cost?
- How much change should I receive?
- How long will the trip take?
- Which object is longer?
- Which container holds more?
Measurement and money are useful every day.
Activity
Find five objects around your home or classroom.
Estimate whether each is:
- shorter or longer than one foot
- lighter or heavier than a book
Then look at a clock and write the current time.
Finally, count a small group of coins and find their total value.
Practice
Answer these questions.
Which is longer:
8 inches or 1 foot?
How many cents are in:
2 dimes and 3 pennies?
What hand on a clock shows the minutes?
Would you measure the length of a classroom in inches or feet?
Name two units used to measure liquids.
Review
Today you learned:
- different units measure different things
- clocks help us tell time
- money has different values
- measurement helps describe the world
- mathematics solves everyday problems
The more you practice these skills, the more useful mathematics becomes.
Looking Ahead
Next we will begin our science studies by learning how scientists observe, ask questions, and investigate the world around them.
Science begins with curiosity.