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# Measurement

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### Measurement

1. 1. Measurement T- 1-855-694-8886 Email- info@iTutor.com By iTutor.com
2. 2. What Do We Measure? We measure  Time  Length & perimeter  Area  Capacity & volume  Weight © iTutor. 2000-2013. All Rights Reserved
3. 3. Time Units Seconds  The smallest unit of time on a clock. Minutes  There are 60 seconds in one minute. Hours  There are 60 minutes in one hour. Days  There are 24 hours in one day. Weeks  There are 7 days in one week. Months  The number of days and weeks in a month is different for each month. Years  There are 365 ¼ days in one year. Decades  There are 10 years in one decade. Centuries  There are 100 years or 10 decades in one century. Millennia  There are 1000 years, 100 decades, or 10 centuries in one millennium. © iTutor. 2000-2013. All Rights Reserved
4. 4. Measuring Time  Reading an Analog clock:  The big, dark hand tells us the minute.  The small, dark hand tells us the hour.  The long, red hand tells us the second. Hour hand Second hand Minute hand The shorter of the two hands on this clock is the hour hand. The minute hand is longer © iTutor. 2000-2013. All Rights Reserved
5. 5. Measuring Time There are three hands in the clock  Hour hand of the clock  Minute hand of the clock  Second’s hand of the clock  Each movement of Second’s hand marking Passing Seconds.  You can count these marking of the clock , you find there are 60 markings. After these 60 markings minute’s hand marks making a minute. So you can say that 1 minute = 60 seconds  After 60 marking of minute’s hand makes 1 hour . © iTutor. 2000-2013. All Rights Reserved
6. 6. Reading an Analog clock: What time does this clock show?  The hour hand is between the 9 and the 10.  The minutes can be counted by fives using the numbers on the clock beginning at the 12. i.e., 30 min The time shown is 9:30, or “half-past Nine.” In this clock the hour hand is between 10 to 11 . And the minutes can be counted by fives using the number on the clock beginning at the 12 is 9 min , also second hands is at 12 The time shown is 10:09:00. © iTutor. 2000-2013. All Rights Reserved
7. 7. AM and PM  “AM” stands for the Latin phrase Ante Meridiem  which means “before noon”  “PM” stands for Post Meridiem :  Means “after noon.”  What is Noon and Midnight?  A.M. and P.M. start immediately after Midnight and Noon (Midday) respectively.  This means that 00:00 A.M. or 00:00 P.M. (or 12:00 A.M. and 12:00 P.M.) have no meaning.  Every day starts precisely at midnight and A.M. starts immediately after that point in time e.g. 00:00:01 A.M. © iTutor. 2000-2013. All Rights Reserved
8. 8. Measuring Length  Length is the size of a straight line, distance, or straight edge on an object.  We measure length with a ruler. Each ruler is divided into units. When using a ruler, line up the edge of the ruler with the start of the line or side you are measuring and read the line where the side or object ends. So this rectangle is 4 6/10 of a cm long or 4.6 cm long. © iTutor. 2000-2013. All Rights Reserved
9. 9. Units for Length There are two major units for measurements: Metric units are used all over the world. The base unit is the meter. All other units are meters multiplied or divided by a power of 10. 1 centimeter (cm)=10 millimeters (mm) 1 meter (m)=100 cm=1000 mm 1 kilometer=1000 m=100,000 cm=1,000,000 mm © iTutor. 2000-2013. All Rights Reserved
10. 10. Prefix Symbol Factor Number Factor Word Kilo k 1,000 Thousand Hecto h 100 Hundred Deca da 10 Ten Deci d 0.1 Tenth Centi c 0.01 Hundredth Milli m 0.001 Thousandth © iTutor. 2000-2013. All Rights Reserved
11. 11. Customary Units for Length U.S. customary units are only used in the U.S.  The smallest unit is the inch, but on a ruler, an inch can be divided up into smaller pieces—halves, quarters, eighths, sixteenths, even thirty-seconds!  1 foot (ft.) = 12 inches (in.)  3 ft. = 1 yard (yd.)  1760 yds. = 1 mile (mi).  5,280 ft. = 1 mi. 1 in. = 2.54 cm 1 ft. = 0.305 m 1 yd.= 0.914 m 1 mi.= 1.61 km © iTutor. 2000-2013. All Rights Reserved
12. 12. Comparison of English and SI Units 1 inch 2.54 cm 1 inch = 2.54 cm © iTutor. 2000-2013. All Rights Reserved
13. 13. Reporting Measurements • Using significant figures • Report what is known with certainty • Add ONE digit of uncertainty (estimation) © iTutor. 2000-2013. All Rights Reserved