CLASS 4 MATHS WORKSHEET LESSON 12

Ticking Clocks and Turning Calendar (Preparatory Stage Math)

Concepts • Computational Skills • Problem-Solving & Modeling • 10 questions each • 40% Easy, 40% Average, 20% Challenging • One toggle shows Answer + Solution

Worksheet A: Concepts

Easy

Q1. How many days are in most years, and how many in a leap year?

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Answer

Most years: 365; leap year: 366.

Solution

A leap year adds one day in February (29th), so total days become 366 instead of 365.

Easy

Q2. February 2024 has 29 days, but February 2025 has how many days?

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Answer

28 days.

Solution

Only leap years include 29 February; the next year reverts to 28 days in February.

Easy

Q3. Name the day that comes after Monday and the day that comes before Sunday.

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Answer

After Monday: Tuesday; before Sunday: Saturday.

Solution

Days follow a fixed weekly order; moving forward or backward finds the neighbor days.

Easy

Q4. Which time label indicates morning: AM or PM?

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Answer

AM.

Solution

AM indicates times from midnight to just before noon; PM indicates afternoon to just before midnight.

Average

Q5. July 1 is a Monday. Write the dates for the next two Mondays in July (add 7 days each time).

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Answer

July 8 and July 15.

Solution

Weekdays repeat every 7 days, so add 7 and 14 to the date to find the next Mondays.

Average

Q6. Fill in consecutive leap years around 2024: __, 2024, __ (increase/decrease by 4 years).

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Answer

2020 and 2028.

Solution

Leap years typically occur every 4 years; 2020 before and 2028 after 2024.

Average

Q7. What is 12:00 noon in 24-hour time, and what is 12:00 midnight in 24-hour time?

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Answer

Noon: 1200 hours; Midnight: 0000 hours.

Solution

12:00 PM equals 1200; 12:00 AM starts the day at 0000 on digital clocks.

Average

Q8. Which is the “day after tomorrow” if today is Wednesday?

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Answer

Friday.

Solution

Move two days forward: Thursday, then Friday for the “day after tomorrow.”

Challenging

Q9. Notice the weekday pattern for the 15th of July, August, September, and October in a calendar. Predict how the weekday often shifts from month to month (by 2 or 3 days) and explain why months of 31/30 days cause such shifts in general terms.

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Answer

Weekday shifts by 3 days after a 31-day month and by 2 days after a 30-day month.

Solution

Since 28 days equal exactly 4 weeks, extra 2 or 3 days push the weekday forward by 2 or 3 respectively depending on month length.

Challenging

Q10. A child born on 29 February celebrates on the same date only in leap years. Between 2016 and 2032, list the leap years for birthday-on-the-date celebrations (inclusive range).

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Answer

2016, 2020, 2024, 2028, 2032.

Solution

Leap years occur every 4 years in this span, so add 4 repeatedly starting from 2016.

Worksheet B: Computational Skills

Easy

Q1. Convert 7:00 AM to 24-hour time, and 7:00 PM to 24-hour time (write both).

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Answer

0700 hours; 1900 hours.

Solution

AM times copy as 0–11 hours; PM times add 12 to the hour except for noon which is 1200.

Easy

Q2. Fill: 1 hour equals how many minutes? 30 minutes equals what fraction of an hour?

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Answer

60 minutes; one-half of an hour.

Solution

There are 60 minutes in an hour; 30 is half of 60, so 30 minutes is half an hour.

Easy

Q3. Show two quarter-hours make how many minutes; show four quarter-hours make how many minutes (write both totals).

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Answer

30 minutes; 60 minutes.

Solution

One quarter-hour is 15 minutes; doubling gives 30, and four quarters complete 60 minutes.

Easy

Q4. Which is later in the day: 08:00 PM or 20:00 hours (choose and explain briefly)?

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Answer

They are the same time.

Solution

08:00 PM equals 20:00 in 24-hour format; both indicate evening at the same moment.

Average

Q5. Convert to 24-hour time: 1:00 AM, 3:00 AM, 12:00 PM, 11:45 PM (write each as “_____ hours”).

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Answer

0100 hours; 0300 hours; 1200 hours; 2345 hours.

Solution

AM hours are written with leading zero; noon is 1200; PM hours add 12 to the hour, so 11:45 PM is 23:45.

Average

Q6. Raghav leaves home at 8:20 AM and returns at 8:35 AM. How much time did the trip take (minutes)?

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Answer

15 minutes.

Solution

From 8:20 to 8:35 is a difference of 15 minutes; count forward or subtract minutes directly.

Average

Q7. Homework starts at 10:20 AM and takes 25 minutes. Write the finishing time in AM/PM and in 24-hour format (both forms).

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Answer

10:45 AM; 1045 hours.

Solution

Add 25 minutes to 10:20 to get 10:45; in 24-hour time this is 1045 hours.

Average

Q8. A story starts at 4:15 PM and lasts 45 minutes. What is the finishing time in AM/PM and in 24-hour format (both)?

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Answer

5:00 PM; 1700 hours.

Solution

4:15 + 45 minutes = 5:00 PM; converting PM hour 5 gives 1700 in 24-hour time.

Challenging

Q9. A dosing chart shows 08:00 and 20:00 for medicine. Explain in words what these two times mean in AM/PM for the day’s routine and why labels help avoid confusion.

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Answer

08:00 is 8:00 AM morning; 20:00 is 8:00 PM evening; labels avoid mixing morning/evening doses.

Solution

AM/PM or 24-hour labels clearly distinguish times that look similar on a 12-hour clock (8 o’clock twice daily).

Challenging

Q10. “Equal-change” trick: Find 430 − 198 by adding the same number to both terms to simplify, then compute the result (state both the adjusted subtraction and the final difference).

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Answer

432 − 200 = 232; result 232.

Solution

Shift both by +2 to use friendlier numbers; equal changes preserve differences, making subtraction easier mentally.

Worksheet C: Problem-Solving & Modeling

Easy

Q1. If today is Monday, write the names for yesterday and the day after tomorrow (two answers required).

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Answer

Yesterday: Sunday; Day after tomorrow: Wednesday.

Solution

Move one day back for yesterday; move two days forward for the day after tomorrow from Monday.

Easy

Q2. Read a wrapper: MFD 05/2025, EXP 11/2025. How many months between manufacturing and expiry (assume end of month for simplicity)?

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Answer

About 6 months.

Solution

From May to November includes Jun, Jul, Aug, Sep, Oct, Nov = 6 months of shelf life.

Easy

Q3. A doctor’s day chart shows activities from 6:00 AM to 6:00 PM. How many hours are there in this interval, and how many hours in a full day?

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Answer

12 hours; 24 hours.

Solution

Morning 6 to evening 6 spans 12 hours; a full day covers 24 hours from midnight to midnight.

Easy

Q4. “Quarter of an hour” equals how many minutes, and how many such quarters make one hour (answer both parts)?

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Answer

15 minutes; four quarters make one hour.

Solution

One hour is 60 minutes; dividing by 4 gives 15 minutes per quarter.

Average

Q5. Akira leaves home at 8:00 AM and reaches school in 15 minutes. Has one hour passed by 9:00 AM? Explain using minutes and hours relation briefly.

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Answer

No; only 15 minutes passed for the trip.

Solution

From 8:00 to 8:15 is 15 minutes; one hour equals 60 minutes, which is larger than 15 minutes.

Average

Q6. Fill the timetable gap: Assembly ends at 8:30 AM. If school started at 8:00 AM and the assembly took 20 minutes, what happened between 8:10 and 8:30 AM (state the ongoing event)?

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Answer

Assembly continued from 8:10 to 8:30 AM.

Solution

From 8:10 (10 minutes after 8:00) to 8:30 is 20 minutes, matching the assembly duration given.

Average

Q7. July 15 is a Monday. What weekday is August 15 likely to be (use month-length reasoning), and explain the shift in one sentence.

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Answer

Thursday (shift by 3 days after July’s 31 days).

Solution

A 31-day month adds 3 extra days beyond complete weeks, pushing the weekday forward by 3.

Average

Q8. A digital clock shows 23:45. Write this time in AM/PM format and say if it is late evening or morning time (both parts).

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Answer

11:45 PM; late evening/night.

Solution

Subtract 12 from the hour part for PM times beyond 12:00 to convert to 12-hour format with PM label.

Challenging

Q9. Two friends challenge: pick any date (like the 10th). If this month’s 10th is on a Tuesday, predict the 10th next month using month-length logic; then check the prediction rule (2-day shift for 30-day months, 3-day for 31-day months) on a calendar in class (state the predicted weekday only).

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Answer

If next month has 31 days → Friday; if 30 days → Thursday.

Solution

Start from Tuesday and shift by +3 for 31-day months, +2 for 30-day months to get the next month’s weekday.

Challenging

Q10. Festival planning: A festival falls on 04/07/2014 (DD/MM/YYYY) for Laali, and Chotu’s birth date is 04/12/2019. Who is older and by roughly how many years and months (state older child and an approximate difference)?

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Answer

Laali is older by about 5 years and 5 months (to Dec 2019 checkpoint).

Solution

From July 2014 to December 2019 is 5 years and 5 months; Laali’s date precedes Chotu’s by that span.

Two best activities

Activity 1: Human Clock and Timeline Walk

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Answer

Physical modeling of AM/PM and elapsed time using a floor clock face and a wall timeline.

Solution

Tape a big clock on the floor; two students are hour/minute hands to show times called out (e.g., 10:20 AM, then +25 minutes). Next, shift to a wall “day timeline” from 0000 to 2400; learners place event cards (wake, school, play, dinner) and convert each to both formats, then compute gaps (e.g., 08:20–08:35 = 15 minutes). This builds embodied sense of 12h–24h and durations.

Activity 2: Calendar Wheel and Leap-Year Hunt

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Answer

Make a month-wheel to track weekday shifts and circle leap-year Februaries.

Solution

Create a rotating “weekday arrow” over a printed month strip; turning from a 30-day to next month advances 2 days, from 31-day advances 3 days. Learners test July→Aug→Sep→Oct for a chosen date (like the 15th), then mark Feb 29 in leap years on a class timeline (2016, 2020, 2024, 2028…). This concretizes why weekdays shift and how leap years add a day.