Page 201 - Math Genius C4

E:\Working\Orange_Education\Math_Genius_4\Open_Files\Chap-11
\\September 30, 2025 12:00 PM Bharat Arora P-9 Reader _________________________ Date: ___________________74

1. Fill in the blanks.

(a) 2 hours = _________ minutes (b) 1 day = _________ hours

(c) 20 weeks = _________ days (d) 3 years = _________ days

2. Match the time shown on the clock with the written time.

(a) (b) (c) (d)
11 12 1 11 12 1 11 12 1 11 12 1
10 2 10 2 10 2 10 2
9 3 9 3 9 3 9 3
8 4 8 4 8 4 8 4
7 6 5 7 6 5 7 6 5 7 6 5

(i) 12:30 (ii) 2:15 (iii) 11:00 (iv) 5:15

Reading and wRiting time in houRs and minutes

We know that there are 12 numbers on the clock’s face and 1 2 3 4
there are an equal number of markings, between each pair 55 60 5
of consecutive numbers. 12
50 11 1 10
There are 60 markings on the whole dial. Each marking 10 2
represents a minute. 45 9 3 15
8 4
The minute hand takes 1 minute to move from one marking 40 7 6 5 20

to the next. 35
30 25
There are a total of 60 minutes in 1 hour.
That is, 1 hour = 60 minutes.

Since 60 minutes ÷ 12 = 5 minutes, the difference between 60
55
two big markings is 5 minutes. 12
50 11 1 10
When the minute hand moves from 12 to 1, it means 5 10 2 11 12 13 14
minutes have passed. 45 9 3 15

Similarly, when the minute hand moves from 12 to 2, it 8 4

means 2 × 5 = 10 minutes have passed. 40 7 6 5 20
The next marking of the number 3 shows 3 × 5 = 15 minutes. 35 30 25

The four small markings between numbers 2 and 3 show 11, 12, 13 and 14 minutes
respectively.

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