Study P2 Mathematics Time 1 - Geniebook

# Time 1

1. Telling time to the minute
2. Converting time

## Topic Recap:

### Telling Time To 5 minutes

A clock is used to tell the time.

The units for measuring time are hour (h) and minute (min).

Each number on a clock represents an interval of five minutes.

## Topic Recap:

### Use Of am & pm

am’ is used to refer to timings before noon/in the morning.

pm’ is used to refer to timings in the afternoon and/or night.

Example:

Fill in the blanks with either am or pm.

1. Ricardo eats his breakfast at 8:30 __________.
2. Shirley likes to go for an early morning jog at 7:00 __________.
3. After dinner, Melissa watches her favourite cartoon at 8:00 __________.

1. Ricardo eats his breakfast at 8:30 am.
2. Shirley likes to go for an early morning jog at 7:00 am.
3. After dinner, Melissa watches her favourite cartoon at 8:00 pm.

Question 1:

The clock below shows the time Jason wakes up every morning.

What time does Jason wake up every morning?

1. 6:45 am
2. 7:45 pm
3. 9:35 am
4. 6:45 pm

Solution:

The hour hand is between 6 and 7. This means that the time is after 6 o’clock. The minute hand is pointing to 9. This means that the time is 6:45.

6:45 in the morning is 6:45 am.

(1) 6:45 am

Question 2:

The clock below shows the time when Mrs Lee started making dinner.

What time did Mrs Lee start preparing dinner?

1. 5.15 am
2. 5:15 am
3. 5:15 pm
4. 6:15 pm

Solution:

The hour hand is between 5 and 6. This means that the time is after 5 o’clock. The minute hand is pointing to 3. This means that the time is 5:15.

5:15 in the afternoon is 5:15 pm.

(3) 5.15 pm

## 1. Telling Time To The Minute

Every number on the clock represents a time interval of 5 minutes.

Every line in between the numbers represents a time interval of 1 minute.

The time on this clock will be 11:36.

Question 1:

Look at the picture below.

Hannah is doing her homework at __________ pm.

1. 3:49
2. 4:49
3. 4:50
4. 5:49

(2) 4:49

Question 2:

Look at the picture below.

The performance ended at __________ pm.

1. 7:22
2. 7:23
3. 8:22
4. 8:23

(3) 8:22

Question 3:

The clock below shows the time Mary had her breakfast.

What time did Mary have her breakfast?

1. 7:13 am
2. 7:14 am
3. 7:15 am
4. 7:23 am

(1) 7:13 am

## 2. Converting Time

To convert hours and minutes to minutes,

we need to remember that there are 60 minutes in 1 hour.

For example,

1. $$1 \text{ h } = 60 \text{ min }$$
2. $$2 \text{ h } = 120 \text{ min }$$
3. \begin{align}​​\\ ​1 \text{ h } 20 \text{ min } &= 60 \text{ min } + 20 \text{ min } \\ &​=80 \text{ min } \end{align}

Question 1:

Kenny took $$2 \text{ h } 25 \text{ min }$$ to reach the airport by train. How long did Kenny take to reach the airport in minutes?

Solution:

Break $$2 \text{ h } 25 \text{ min }$$ into hours and minutes.

\begin{align}​​ 2 \text{ h } 25 \text{ min } &= 2 \text{ h } + 25 \text{ min } \\[2ex] &= 120 \text{ min } + 25 \text{ min } \\[2ex] &= 145 \text{ min } \end{align}

$$145\text{ min }$$

Question 2:

Write the following in minutes.

1. 60 minutes
2. 180 minutes
3. 240 minutes
4. 300 minutes

Solution:

\begin{align}​​ 5 \text{ h } &= 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 1 \text{ h } \\[2ex] &= 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 60 \text{ min }\\[2ex] &= 300 \text{ min } \end{align}

(4) 300 minutes

Question 3:

Write the following in minutes.

1. 50 minutes
2. 60 minutes
3. 100 minutes
4. 110 minutes

Solution:

\begin{align}​​ 1 \text{ h } 50 \text{ min } &= 60 \text{ min } + 50 \text{ min } \\[2ex] &= 110 \text{ min } \end{align}

(4) 110 minutes

Question 4:

Write the following in minutes.

1. 240 minutes
2. 245 minutes
3. 285 minutes
4. 295 minutes

Solution:

\begin{align}​​ 4 \text{ h } 45 \text{ min } &= 4 \text{ h } + 45 \text{ min } \\[2ex] &= 240 \text{ min } + 45 \text{ min }\\[2ex] &= 285 \text{ min } \end{align}

(3) 285 minutes

Question 5:

The movie ‘Musical Return of Gitan’ lasted for $$140 \text{ min}$$. How long was the movie in hours and minutes?

Solution:

Break $$140 \text{ min}$$ into hours and minutes.

\begin{align}​​ 140 \text{ min } &= 120 \text{ min }+ 20 \text{ min } \\[2ex] &= 2 \text{ h }+ 20 \text{ min } \\[2ex] &= 2 \text{ h } 20 \text{ min } \end{align}

2 h 20 min

Question 6:

Look at the following.

1. 1 h
2. 1 h 2 min
3. 1 h 12 min
4. 1 h 20 min

Solution:

\begin{align}​​ 62 \text{ min } &= 60 \text{ min }+ 2 \text{ min }\\[2ex] &= 1 \text{ h } + 2 \text{ min }\\[2ex] &= 1 \text{ h } 2 \text{ min } \end{align}

(2) 1 h 2 min

Question 7:

Write in hours and minutes.

1. 2 h 5 min
2. 3h  5 min
3. 3 h 15 min
4. 4 h 25 min

Solution:

Break $$185 \text{ min}$$ into hours and minutes.

\begin{align}​​ 185 \text{ min } &= 60 \text{ min }+ 60 \text{ min }+ 60 \text{ min }+ 5 \text{ min }\\[2ex] &= 1 \text{ h }+ 1 \text{ h }+ 1 \text{ h }+ 5 \text{ min } \\[2ex] &= 3 \text{ h }+ 5 \text{ min }\\[2ex] &= 3 \text{ h } 5 \text{ min } \end{align}

(2) 3 h 5 min

Question 8:

Write in hours and minutes.

1. 6 h 45 min
2. 6 h 55 min
3. 7 h 45 min
4. 7 h 55 min

Solution:

Break $$475 \text{ min}$$ into hours and minutes.

\begin{align}​​ 475 \text{ min } &= 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 60 \text{ min } + 55 \text{ min } \\[2ex] &= 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 1 \text{ h } + 55 \text{ min }\\[2ex] &= 7 \text{ h } + 55 \text{ min }\\[2ex] &= 7 \text{ h } 55 \text{ min } \end{align}

(4) 7 h 55 min

• Telling time to the minute
• Converting time

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