Time Goes On — NCERT Solutions

Given: Bincy was born on 2 May 2015.

Calculation:
$$2015 + 8 = 2023$$

Answer: Bincy's 8th birthday was on 2 May 2023.

Given: Bincy was born on 2 May 2015. We need her age on 2 August 2015.

Counting months from May to August:

• May 2 → June 2: 1 month
• June 2 → July 2: 2 months
• July 2 → August 2: 3 months

Answer: Bincy was 3 months old on 2 August 2015.

Given:

• Date of Birth: 2 May 2015
• Date of Issue of Certificate: 18 May 2015

Calculation:
$$18 - 2 = 16 \text{ days}$$

Answer: The certificate was issued 16 days after her birth.

This is a personal activity. Students should fill in their own details.

Sample filled certificate:

• Form Number: (your school/local form number)
• Government of: (your State name, e.g., Government of Maharashtra)
• Name: (Your full name)
• Sex: Male / Female
• Date of Birth: DD/MM/YYYY
• Place of Birth: (Name of hospital/city)
• Name of Father: (Father's full name)
• Name of Mother: (Mother's full name)
• Date of Making Certificate: (Today's date)
• Age on the date of making the certificate: (Calculate: Current year − Birth year = age in years)
• Your Signature: (Sign here)

Tip to find age: Subtract your birth year from the current year. For example, if born in 2016 and current year is 2025: $2025 - 2016 = 9$ years.

This is a personal activity. Students should fill in their own dates.

How to fill:

• Date of Birth: From your birth certificate (DD/MM/YYYY).
• Date of admission to school: From your school admission record.
• Date of admission to Class 1: From school records (usually the year after Kindergarten/Nursery).
• Date of admission to Class 3: From school records (two years after Class 1).

Example (sample):

Given:

• Start time: 07:00 (7 o'clock)
• End time: 07:15

Concept: The difference between the two times gives the duration.

$$07:15 - 07:00 = 15 \text{ minutes}$$

She took 15 minutes to eat her breakfast.

How do we know? The minute hand moved from the 12 (at 07:00) to the 3 (at 07:15). Each number on the clock represents 5 minutes, so from 12 to 3 = $3 \times 5 = 15$ minutes.

Given: Time = 8:15 (quarter past 8)

Drawing instructions:

• Minute hand: Points to 3 (since 15 minutes = quarter of an hour, the minute hand is at the 3).
• Hour hand: Points slightly past 8 (the hour hand has moved one-quarter of the way between 8 and 9).

Note: Draw the minute hand (longer) pointing to 3, and the hour hand (shorter) pointing just past 8 on the clock face.

Given: Time = 8:30 (half past 8)

Drawing instructions:

• Minute hand: Points to 6 (since 30 minutes = half an hour, the minute hand is at the 6).
• Hour hand: Points exactly halfway between 8 and 9 (the hour hand has moved halfway between 8 and 9).

Note: Draw the minute hand (longer) pointing straight down to 6, and the hour hand (shorter) pointing exactly between 8 and 9 on the clock face.

Given examples are already provided. Students add their own. Sample answers:

Note: These are based on the student's own school schedule. Typical sample answers are given below.

Students should observe their own school timetable and fill in the actual minutes.

This is an open-ended activity. Sample answers:

Students should write activities from their own daily routine.

Concept: To find the time elapsed, count how many minutes the minute hand has moved from the start position to the end position. Each number on the clock = 5 minutes.

General rule:
$$\text{Minutes passed} = (\text{End position of minute hand} - \text{Start position of minute hand}) \times 5$$

Example entries (based on typical clock images shown in the book):

Note: Students should look at the actual clock images in their textbook and count the minute hand movement to fill in the correct answers.

Analog Clock:

• Shows time using moving hands (hour hand, minute hand, and sometimes second hand).
• Has a circular face with numbers 1 to 12.
• You read the time by looking at where the hands point.

Digital Clock:

• Shows time using digits/numbers directly on a display (e.g., 10:30).
• Has no moving hands.
• Time is read directly from the numbers shown.

Main Difference: An analog clock uses hands on a circular dial to show time, while a digital clock displays time directly as numbers.

This is an observation-based question. Students should look at their classroom wall and answer.

Most school classrooms have an Analog clock (with hour and minute hands on a circular face).

Answer: Our school has an analog clock on the wall. (Students write whichever type their school has.)