CONFIDENTIAL 1

Good Afternoon!Today we will be learning about

Elapsed time

Let’s warm up :

Find the amount of change:

1) Price: $13.69 Amount Given: $20.00

2) Price: $5.78 Amount Given: $10.00

Round the given money amount :

3) $5.07, $4.58, $8.69

4) $14.78, $24.22, $32.57

CONFIDENTIAL 2

Let’s review the previous topicMoney (make change, compare and order)

Currency: It is a unit of exchange, facilitating the transfer of goods and/or services.

It is one form of money, where money is anything that serves as a medium of

exchange, a store of value, and a standard of value.

To facilitate trade between currency zones, there are exchange rates, which are the prices at which

currencies (and the goods and services of individual currency zones) can be exchanged against each

other.

CONFIDENTIAL 3

Coins and paper money are both forms of currency.

o Pennyo 1 penny,o 1 cent,o or 1¢

oNickel1 nickel,5 cents, or 5¢5 cents= 1 nickel

oDime1 dime,10 cents

Review

CONFIDENTIAL 4

Review

oQuarter1 quarter,25 cents,

Dollar Bill1 Dollar100 cents,or 100¢Count by 100 to count dollars.$1.00, $2.00, $3.00 and so on.4 quarters = 1 Dollar20 nickels = 1 Dollar10 dimes = 1 Dollar

CONFIDENTIAL 5

Make Change

Start at $7.67. Count up to $10.00

$7.68 $7.69 $7.70 $7.75 $8.00 $9.00 $10.00

Mary bought a bag at a price of $7.67; Amount given to the shopkeeper was $10.00. What change did she

get?

Review

CONFIDENTIAL 6

Review

To check the change count the bills and coins from the greatest to least value.

$1.00 $2.00 $2.25 $2.30 $2.31 $2.32 $2.33

So Mary should receive $2.33 as change.

Make Change

CONFIDENTIAL 7

Review

Compare and Order Money Amounts

You can use a place value chart to compare money amounts.

Start at left. Look for the first place where the digits are different.

Example: Compare $306.97 and $319.23Hundred Dollars

Ten Dollars

One Dollar

Cents

3 0 6 97

3 1 9 23

Same different

The amount $319.23 has more ten dollars than $306.97So, $319.23 > $306.97

CONFIDENTIAL 8

ReviewRound Money

Round: $7.13, $6.89, $6.95

Step 1: Find the digit in the dollars place.

•$7.13•$6.89•$6.95

Step 2: Look at the place to the right of the dollars place.

•$7.13•$6.89•$6.95

Step 3: If the digit is less than 5, round down. If the digit is 5 or greater, round up.

$7.13 $7.00$6.89 $7.00$6.95 $7.00

CONFIDENTIAL 9

Let’s start the topicElapsed time

A.M.: A name for time between 12:00 midnight and 12:00 noon. On school days you might wake up at 7:00 A.M.

P.M.: A name for time between 12:00 noon and 12:00 midnight. Many people eat dinner at 6:00 P.M.

Today we will discuss about the time.

A day has 24 hours. These 24 hours is divided into two time zones. These are “A.M.” and

“P.M.”.

The standard unit of time is second.

CONFIDENTIAL 10

Time Facts60 seconds 1 minute

15 minutes 1 quarter-hour

60 minutes 1 hour

90 minutes 1 ½ hours

180 minutes 3 hours

The simple conversion table for time is:

To convert from minutes to seconds multiply by 60 and to convert from seconds to minutes divide by

60. Similarly,

To convert from hours to minute multiply by 60 and to convert from minute to hours divide by

60.

CONFIDENTIAL 11

9:15 A.M. Nine-fifteen in the

morning, or Quarter after nine, or Fifteen minutes after

nine

4:25 P.M. Four twenty-five in the

afternoon, or 25 minutes after 4

Tell Time

CONFIDENTIAL 12

Tell Time

15 minutes (min) =¼ hour (1/4 h) or

1 quarter hour

30 minutes (min) =½ hour (1/2 h) or2 quarter hours

CONFIDENTIAL 13

45 minutes (min) =¾ hour (3/4 h) or3 quarter hours

60 minutes (min) =1 hour (1 h) or4 quarter hours

Tell Time

CONFIDENTIAL 14

Elapsed Time

Elapsed Time: It is the amount of time that passes from the start to the end of an activity.

Example: How much time has elapsed between 8:20 A.M. and 11:35 A.M.?

CONFIDENTIAL 15

Step 1: First count the number of hours.

Elapsed Time

From 8:20 to 11:35 is 3 hours.

CONFIDENTIAL 16

From 11:20 to 11:35 is 15 minutes.

Step 2: Then count the number of minutes.

Elapsed Time

So, 3 hours 15 minutes

has passed.

CONFIDENTIAL 17

Count past midnight

What time is 4 hours 20 minutes after 11.00 p.m.?

Start at 11.00 p.m. Count on 4 hours.

11.00 -> 12.00 -> 1.00 -> 2.00 -> 3.00

Add on 20 minutes: 3.20 a.m.

(Note: After 12.00 midnight write A.M.)

So, 4 hours 20 minutes after 11.00 p.m. is 3.20 a.m.

CONFIDENTIAL 18

Assessment

Complete the conversion tables:

Hours 1 2 3 4 5

Minutes 60 180

Seconds 60 120 180 240 300

Minutes 1 4

Hours 5 8

Minutes 180 360 540

1)

2)

3)

CONFIDENTIAL 19

Calculate how much time has elapsed between:

4) 5:30 A.M. and 8:35 A.M.?

5) 7:55 P.M. and 10:40 P.M.?

6) 2:15 A.M. and 9:25 A.M.?

7) 8:30 P.M. and 9:40 P.M.?

CONFIDENTIAL 20

Calculate how much time has elapsed between:

8) 8:30 A.M. and 1:10 P.M.?

9) 9:35 A.M. and 3:40 P.M.?

10) 10:15 P.M. and 9:25 A.M.?

CONFIDENTIAL 21

Very Good!Let's Review

A.M.: A name for time between 12:00 midnight and 12:00 noon. On school days you might wake up at 7:00 A.M.

P.M.: A name for time between 12:00 noon and 12:00 midnight. Many people eat dinner at 6:00 P.M.

A day has 24 hours. These 24 hours is divided into two time zones. These are “A.M.” and “P.M.”.

Time Facts

60 seconds 1 minute

15 minutes 1 quarter-hour

60 minutes 1 hour

90 minutes 1 ½ hours

180 minutes 3 hours

The simple conversion table for time is:

CONFIDENTIAL 22

Review

9:15 A.M. Nine-fifteen in the

morning, or Quarter after nine, or Fifteen minutes after

nine

4:25 P.M. Four twenty-five in the

afternoon, or 25 minutes after 4

Tell Time

CONFIDENTIAL 23

Review

45 minutes (min) =¾ hour (3/4 h) or3 quarter hours

60 minutes (min) =1 hour (1 h) or4 quarter hours

Tell Time

CONFIDENTIAL 24

Review

Elapsed Time: It is the amount of time that passes from the start to the end of an activity.

How much time has elapsed between 8:20 A.M. and 11:35 A.M.?

Step 1: First count the number of hours.

From 8:20 to 11:20 is 3 hours.

Step 2: Then count the number of minutes. From 11:20 to 11:35 is 15 minutes.

So, 3 hours 15 minutes

has passed.

CONFIDENTIAL 25

Review

Count past midnight

What time is 4 hours 20 minutes after 11.00 p.m.?

Start at 11.00 p.m. Count on 4 hours.

11.00 -> 12.00 -> 1.00 -> 2.00 -> 3.00

Add on 20 minutes: 3.20 a.m.

(Note: After 12.00 midnight write A.M.)

So, 4 hours 20 minutes after 11.00 p.m. is 3.20 a.m.

CONFIDENTIAL 26

You have done a nice job.See you in the next session.