Mastering Time Conversions

What is 3:00 PM in 24-hour format?

• 15:00

• 14:00

• 16:00

• 12:00

Answer explanation

3:00 PM in 12-hour format converts to 15:00 in 24-hour format. The 24-hour clock adds 12 to the PM hours after 12:00 PM, making 3:00 PM equal to 15:00. Therefore, the correct answer is 15:00.

If the clock shows 2:45, what time is it in minutes?

• 165 minutes

• 120 minutes

• 150 minutes

• 180 minutes

Answer explanation

To find the time in minutes, convert 2 hours and 45 minutes to minutes: (2 * 60) + 45 = 120 + 45 = 165 minutes. Therefore, the correct answer is 165 minutes.

Convert 5 hours into minutes.

• 360 minutes

• 180 minutes

• 300 minutes

• 250 minutes

Answer explanation

To convert hours to minutes, multiply by 60. Thus, 5 hours x 60 minutes/hour = 300 minutes. Therefore, the correct answer is 300 minutes.

Tags

CCSS.4.MD.A.1

How many seconds are there in 4 minutes?

• 300

• 240

• 180

• 120

Answer explanation

To find the number of seconds in 4 minutes, multiply 4 by 60 (the number of seconds in a minute). This gives 240 seconds, making the correct answer 240.

Tags

CCSS.4.MD.A.1

If a week has 7 days, how many hours are in a week?

• 144 hours

• 168 hours

• 120 hours

• 200 hours

Answer explanation

A week has 7 days, and each day has 24 hours. Therefore, to find the total hours in a week, multiply 7 days by 24 hours: 7 x 24 = 168 hours. Thus, the correct answer is 168 hours.

Tags

CCSS.4.MD.A.1

What is 15:30 in 12-hour format?

• 3:30 AM

• 2:30 PM

• 4:30 PM

• 3:30 PM

Answer explanation

15:30 in 24-hour format corresponds to 3:30 PM in 12-hour format. The hour '15' is converted by subtracting 12, resulting in '3', and since it's in the afternoon, we add 'PM'.

Tags

CCSS.1.MD.B.3

If the clock shows 10:15, what is the angle between the hour and minute hands?

• 142.5 degrees

• 90 degrees

• 180 degrees

• 120 degrees

Answer explanation

At 10:15, the hour hand is at 10.25 (10 + 15/60) and the minute hand is at 90 degrees (15 minutes). The angle is |(10.25 * 30) - (90)| = |307.5 - 90| = 217.5 degrees. The smaller angle is 360 - 217.5 = 142.5 degrees.

Convert 2 days into hours.

• 24 hours

• 36 hours

• 72 hours

• 48 hours

Answer explanation

To convert days into hours, multiply the number of days by 24. Therefore, 2 days x 24 hours/day = 48 hours. Thus, the correct answer is 48 hours.

Tags

CCSS.4.MD.A.1

How many seconds are there in 1 hour?

• 60

• 600

• 3600

• 7200

Answer explanation

There are 60 seconds in a minute and 60 minutes in an hour. Therefore, to find the total seconds in an hour, multiply: 60 seconds/minute × 60 minutes/hour = 3600 seconds. Thus, the correct answer is 3600.

Tags

CCSS.4.MD.A.1

If it is 6:00 AM, what time will it be in 3 hours?

• 10:00 AM

• 9:00 AM

• 8:00 AM

• 7:00 AM

Answer explanation

Starting at 6:00 AM, adding 3 hours brings us to 9:00 AM. Therefore, the correct answer is 9:00 AM.

Tags

CCSS.3.MD.A.1