6.12 Time Goes By Worksheet With Answer Key Page 3
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How to
• • • • • • • • • • Calculate Time with
Clocks,
Facts to Know
Time
.
. = morning - 12:00
.
. (midnight) to 11:59
.
.
A
M
A
M
A
M
.
. = afternoon - 12:00
.
. (noon) to 11:59
.
.
P
M
P
M
P
M
60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
To compute elapsed time within the morning or within the afternoon, subtract the smaller number from
the larger number. Remember to regroup (borrow) with 60 minutes.
8:60min
Sample
9:00
.
.
Because you cannot subtract 0 minutes from 38 minutes, subtract 1
P
M
– 7:38
.
.
hour from the 9:00
.
. and convert it to 60 minutes. So when you
P
M
P
M
calculate how much time elapsed between 9:00
.
. and 7:38 p.m., the
P
M
1:22 (1 hr 22 min)
final answer is 1 hour 22 minutes.
To add elapsed time, add the two measurements of time together.
Sample
When you add the two measurements of time together, you have an answer of 218 days 49 hrs 60 min,
but you know that you convert some of the minutes to hours and some hours into days. Using the chart
at the top of the page, you know that 24 hours = 1 day so 49 hours = 2 days 1 hour. Similarly, you
206 days
2 hrs
5 min
know that 60 minutes = 1 hour so after you made all the conversions, the final answer is 220 days and 2
hours have elapsed.
+ 12 days 47 hrs 55 min
218 days 49 hrs 60 min = 220 days 2 hrs
Calendar Facts
7 days = 1 week
28-Day Month
31-Day Months
52 weeks = 1 year
February (29 days in leap year)
January
10 years = 1 decade
March
10 decades = 1 century
30-Day Months
May
10 centuries = 1 millennium
September
July
April
August
June
October
November
December
• Time from the approximate date of the birth of Christ until the present moves progressively from
1 to 2000 +. It is called A.D. (anno domini—in the year of our Lord).
• Time before the birth of Christ counts back from 1 to the earliest recorded history, about 5,000
years. It is called B.C. (before Christ) or B.C.E. (“before the common era”).
• To compute the passage of years within B.C. or within A.D., subtract the lower number from the
higher number.
• To compute the passage of years from B.C. to A.D., add the B.C. date to the A.D. date.
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