Mathematics Grade 7 15 min

Match digital clocks and times

Match digital clocks and times

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1

Introduction & Learning Objectives

Learning Objectives Accurately read and interpret time displayed on digital clocks. Convert between 12-hour (AM/PM) and 24-hour (military) time formats. Correctly identify AM and PM periods for given digital times. Match written time descriptions to their corresponding digital clock displays. Solve problems involving the interpretation and conversion of digital times. Recognize and correct common errors in reading and writing digital times. Ever wondered why some clocks show '15:30' instead of '3:30 PM'? ⏰ Let's unlock the secrets of digital time! In this lesson, you'll learn how to read, interpret, and match digital clock displays with written times, including understanding 12-hour and 24-hour formats. Mastering this skill is crucial for dail...
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Key Concepts & Vocabulary

TermDefinitionExample Digital ClockA clock that displays time numerically, typically using digits (e.g., 10:30).A microwave display showing '12:00' is a digital clock. 12-Hour FormatA time format that divides the day into two 12-hour periods: AM (ante meridiem, before noon) and PM (post meridiem, after noon).7:00 AM (morning) or 7:00 PM (evening). 24-Hour Format (Military Time)A time format that counts hours from 00 to 23, without using AM or PM. Midnight is 00:00, and noon is 12:00.15:00 is 3:00 PM in 12-hour format. AM (Ante Meridiem)The period from midnight (12:00 AM) up to, but not including, noon (12:00 PM).6:30 AM refers to half past six in the morning. PM (Post Meridiem)The period from noon (12:00 PM) up to, but not including, midnight (12:00 AM).6:30 PM refers to half pa...
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Core Formulas

Converting 24-Hour Time to 12-Hour PM Time If the hour in 24-hour format ($H_{24}$) is greater than 12, subtract 12 from $H_{24}$ to get the 12-hour PM hour ($H_{12PM}$). The minutes remain the same. Use this rule when you see a 24-hour time like 13:00 or 20:45 and need to express it using PM. For example, $15:00 \rightarrow 15 - 12 = 3 \rightarrow 3:00 \text{ PM}$. Converting 12-Hour PM Time to 24-Hour Time If the hour in 12-hour PM format ($H_{12PM}$) is between 1 PM and 11 PM (inclusive), add 12 to $H_{12PM}$ to get the 24-hour hour ($H_{24}$). The minutes remain the same. Apply this rule when converting times like 4:15 PM to 24-hour format. For example, $4:15 \text{ PM} \rightarrow 4 + 12 = 16 \rightarrow 16:15$. Note: 12:00 PM (noon) is 12:00 in 24-hour format, no addit...

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Sample Practice Questions

Easy
Which written time correctly matches the digital clock display: 07:15 AM?
A.Quarter past seven in the morning
B.Quarter to seven in the morning
C.Quarter past seven in the evening
D.Fifteen minutes to seven in the morning
Easy
A digital clock in a train station displays the time as 14:00. What time is this in the 12-hour format?
A.2:00 AM
B.2:00 PM
C.12:00 PM
D.14:00 PM
Easy
According to the 'Key Concepts & Vocabulary' section, what is the definition of the 24-Hour Format?
A.time format that divides the day into two 12-hour periods using AM and PM.
B.clock that displays time using hands.
C.time format that counts hours from 00 to 23 without using AM or PM.
D.clock that only shows the minutes and seconds.

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