Mathematics
Grade 2
15 min
Relate time units
Relate time units
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
State that 60 seconds are in 1 minute.
State that 60 minutes are in 1 hour.
State that 24 hours are in 1 day.
State that 7 days are in 1 week.
Compare the length of different time units (e.g., a minute is longer than a second).
Choose the best time unit to measure a simple activity (e.g., brushing teeth takes minutes, not hours).
Have you ever tried to count all the stars at night? β¨ It takes a long time!
Today, we will learn about seconds, minutes, hours, and days. We will see how they are all connected, like a big family of time! π¨βπ©βπ§βπ¦
Real-World Applications
Knowing when your favorite TV show starts πΊ
Timing how fast you can run across the playground πββοΈ
Counting down the days until your birthday π
Knowing how long you have to pla...
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Key Concepts & Vocabulary
TermDefinitionExample
SecondA very, very short amount of time. Like one clap! πIt takes about one second to blink your eyes.
MinuteA group of 60 seconds. Longer than a second.It takes a few minutes to brush your teeth. π¦·
HourA group of 60 minutes. Much longer than a minute.Your favorite movie is about two hours long. π¬
DayA group of 24 hours. It includes daytime and nighttime. βοΈπYou go to school, play, eat, and sleep in one day.
WeekA group of 7 days. Like a whole row of lunchboxes. π±A week goes from Sunday to Saturday.
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Core Formulas
The Minute Rule
60 \text{ seconds} = 1 \text{ minute}
When you count 60 seconds, you have made 1 whole minute.
The Hour Rule
60 \text{ minutes} = 1 \text{ hour}
When 60 minutes pass, that is 1 whole hour. That's a long time!
The Day Rule
24 \text{ hours} = 1 \text{ day}
It takes 24 hours for the Earth to spin around one time.
The Week Rule
7 \text{ days} = 1 \text{ week}
There are 7 days in every week. Can you name them?
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Challenging
A gymnastics class is 45 minutes long. A swimming lesson is 1 hour long. How many minutes longer is the swimming lesson?
A.5 minutes
B.15 minutes
C.30 minutes
D.45 minutes
Challenging
A special package will arrive in 2 weeks and 5 days. How many total days do you have to wait?
A.14 days
B.7 days
C.25 days
D.19 days
Challenging
You spend 1 hour on homework each weekday (Monday to Friday). How many hours do you spend on homework in two full weeks?
A.5 hours
B.7 hours
C.10 hours
D.14 hours
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