Page 218 - Math Genius C4

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\\September 30, 2025 12:00 PM Bharat Arora P-9 Reader _________________________ Date: ___________________74

Mind Map
math Creative Thinking
tiMe

time in Minutes time in Seconds

example: 7:27 a.m.
11 12 1 11 12 1 11 12 1 11 12 1
60 10 2 10 2 10 2 10 2
55 5 9 3 10 seconds 9 3 20 seconds 9 3 30 seconds 9 3
50 11 12 1 10 8 4 later 8 4 later 8 4 later 8 4
10 2 7 6 5 7 6 5 7 6 5 7 6 5
45 9 3 15
8 4 7:20:00 7:20:10 7:20:30 7:21:00
40 7 6 5 20 7 hours 20 minutes 7 hours 20 minutes 7 hours 20 minutes 7 hours 21 minutes
and 0 seconds and 10 seconds and 30 seconds and 0 seconds
35 25
30
Conversion of 24-hour Format to Conversion of Units of time
12-hour Format
2526 27282930
24-Hour Clock Hours into minutes:
examples Example: 4 hours = 4 × 60 minutes
2400 hours
or = 240 minutes
0000 hours 00:44 hours 12:44 a.m.
2300 hours 0100 hours Minutes into seconds:
2200 hours 12 1 0200 hours 00:55 hours 12:55 a.m.
11
2100 hours 10 midnight 2 0300 hours Example: 8 minutes = 8 × 60 seconds
9 3
2000 hours 8 4 0400 hours 01:15 hours 1:15 a.m. = 480 seconds
1900 hours 7 5 0500 hours 08:50 hours 8:50 a.m. Seconds into minutes:
1800 hours 6 p.m. a.m. 6 0600 hours 10:25 hours 10:25 a.m. Example: 480 seconds ÷ 60

= 8 minutes
1700 hours 5 7 0700 hours 12:12 hours 12:12 p.m.
4 8 12:48 hours 12:48 p.m. Minutes into hours:
1600 hours 0800 hours
3 9 Example: 540 minutes ÷ 60
1500 hours 2 noon 10 0900 hours 13:28 hours 1:28 p.m. = 9 hours
1400 hours 1 12 11 1000 hours 16:49 hours 4:49 p.m.
1300 hours 1100 hours
1200 hours 22:17 hours 10:17 p.m.
Addition and Subtraction of time Calendar
example: Add: min sec CALENDAR
28 minutes 32
seconds and 1 JANUARY FEBRUARY MARCH APRIL
24 minutes 42 28 32
seconds.
+ 24 42
53 14
MAY JUNE JULY AUGUST
h min
example: Subtract 5 74
4 hours 44 minutes 6 14
from 6 hours 14 SEPTEMBER OCTOBER NOVEMBER DECEMBER
minutes: – 4 44
1 30

Conversion of years, Months, Weeks and days:
time duration example: 3 years 7 months = 3 years + 7 months = 3 × 12 months + 7 months
= 36 months + 7 months = 43 months.
Starting reaching duration Calculating days:
time time example: Number of days between 20th January and 28th February.
7:15 a.m. 7:45 a.m. 30 minutes = 11 + 27 = 38 days.

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