Use
A.M.
for times beginning at 12:00 midnight and before 12:00 noon
Use
P.M.
for times beginning at 12:00 noon and before 12:00 midnight.
Using
a
calendar
to calculate elapsed time.
Ordinal
numbers
are used to tell order. Numbers like first, fifth, and twelfth
are examples of ordinal numbers.
If you move down 1 row
on a calendar you have counted
1 week. Every time
you move down a row it equal 1 week or 7 days.
December 2006
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Natalie's family leaves for
vacation on December 20th. They go home 9 days later.
What day does her family return?
Step 1
Find December 20th.
Step 2
Use December 20th as the first day of vacation and count 9
days.
Answer- Natalie's family will return on
Thursday, December 28th.
July 2006
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Example One
What date is one week
before July 21st?
Find July 21st on the calendar. Count up one row.
Answer- One week before
July 21st is July 14th.
Example Two
What day of the
week is July 11th?
Find July 11th on the calendar.
Move straight up to the top of the calendar.
Answer- July 11th is a Tuesday.
Remember:
The units
of time are seconds, minutes, hours,
days, weeks, months, and years.
Using
a
calendar
to calculate elapsed time.
