Calendar (Grade 3)
A calendar shows the days, weeks, and months of a year. In Class 3, you learn to read a calendar, find specific dates and days, count the number of days between two dates, and understand the structure of months and years.
Knowing how to use a calendar helps you plan events, remember birthdays, and understand schedules.
What is Calendar - Class 3 Maths (Time (Grade 3))?
A calendar is a chart that shows all the days, weeks, and months in a year.
Key facts about a calendar:
- 1 year = 12 months
- 1 year = 365 days (366 in a leap year)
- 1 week = 7 days
- 1 month = 28, 29, 30, or 31 days
"30 days has September, April, June, and November.
All the rest have 31, except February alone,
which has 28 days clear, and 29 in each leap year."
Types and Properties
Months and Their Days
| Month | Days |
|---|---|
| January | 31 |
| February | 28 (29 in leap year) |
| March | 31 |
| April | 30 |
| May | 31 |
| June | 30 |
| July | 31 |
| August | 31 |
| September | 30 |
| October | 31 |
| November | 30 |
| December | 31 |
Days of the week: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
Leap Year: A leap year has 366 days (February has 29 days). A year is a leap year if it is divisible by 4 (e.g., 2024, 2028).
Solved Examples
Example 1: Example 1: How Many Days in a Month?
Question: How many days are in August?
Think:
- August is not April, June, September, or November (30-day months)
- August is not February
- So August has 31 days
Answer: August has 31 days.
Example 2: Example 2: Finding a Day
Question: If January 1 is a Monday, what day is January 8?
Think:
- 1 week = 7 days
- January 1 (Monday) + 7 days = January 8 (Monday)
Answer: January 8 is also a Monday.
Example 3: Example 3: Days Between Two Dates
Question: How many days are from March 5 to March 20?
Think:
- Count from March 5 to March 20
- 20 − 5 = 15 days
Answer: There are 15 days between March 5 and March 20.
Example 4: Example 4: Finding the Date After Some Days
Question: What date is 10 days after April 22?
Think:
- April has 30 days
- April 22 + 10 = April 32 → but April has only 30 days
- 32 − 30 = 2 → the date is May 2
Answer: 10 days after April 22 is May 2.
Example 5: Example 5: Number of Weeks
Question: How many complete weeks are in February (non-leap year)?
Think:
- February has 28 days
- 28 ÷ 7 = 4 weeks exactly
Answer: February has 4 complete weeks.
Example 6: Example 6: Leap Year Check
Question: Is 2028 a leap year?
Think:
- A year divisible by 4 is a leap year
- 2028 ÷ 4 = 507 (no remainder)
Answer: Yes, 2028 is a leap year. February 2028 will have 29 days.
Example 7: Example 7: Word Problem – Birthday
Question: Ria's birthday is on September 15. Priya's birthday is on September 28. How many days apart are their birthdays?
Think:
- 28 − 15 = 13 days
Answer: Their birthdays are 13 days apart.
Example 8: Example 8: Number of Sundays
Question: If October 1 is a Sunday, how many Sundays are in October?
Think:
- Sundays: Oct 1, 8, 15, 22, 29
- October has 31 days, so 5 Sundays
Answer: There are 5 Sundays in October.
Example 9: Example 9: Months Between Dates
Question: How many months are from March to August?
Think:
- March → April → May → June → July → August
- Count: April, May, June, July, August = 5 months after March
Answer: There are 5 months from March to August.
Example 10: Example 10: Total Days in 3 Months
Question: How many days are in January, February, and March combined (non-leap year)?
Think:
- January = 31, February = 28, March = 31
- Total = 31 + 28 + 31 = 90 days
Answer: 90 days
Real-World Applications
Where Do We Use Calendars?
- School: Knowing exam dates, holidays, and events.
- Birthdays: Planning birthday parties and remembering friends' birthdays.
- Travel: Planning trips, knowing departure dates.
- Festivals: Tracking dates of Diwali, Holi, Eid, Christmas, Pongal.
- Planning: Counting days until an event, scheduling activities.
Key Points to Remember
- 1 year = 12 months = 365 days (366 in a leap year).
- 1 week = 7 days.
- Months with 31 days: Jan, Mar, May, Jul, Aug, Oct, Dec.
- Months with 30 days: Apr, Jun, Sep, Nov.
- February: 28 days (29 in a leap year).
- A leap year is divisible by 4.
- Same day repeats every 7 days (e.g., if Monday is 1st, Monday is also 8th, 15th, 22nd, 29th).
Practice Problems
- How many days are in November?
- If June 3 is a Wednesday, what day is June 10?
- How many days are from July 12 to July 30?
- Is 2032 a leap year?
- What date is 15 days after March 25?
- How many Saturdays are in a month that starts on Saturday and has 31 days?
- Find the total days in June, July, and August.
Frequently Asked Questions
Q1. How many months are in a year?
There are 12 months in a year: January, February, March, April, May, June, July, August, September, October, November, and December.
Q2. How many days are in a year?
A regular year has 365 days. A leap year has 366 days (February has 29 days instead of 28).
Q3. What is a leap year?
A leap year occurs every 4 years and has 366 days. February has 29 days in a leap year. Examples: 2024, 2028, 2032.
Q4. Which months have 31 days?
January, March, May, July, August, October, and December — that is 7 months with 31 days.
Q5. Which months have 30 days?
April, June, September, and November have 30 days.
Q6. How do I find what day a future date falls on?
Count the number of days from a known date. Divide by 7 to find complete weeks. The remainder tells you how many extra days to count forward.
Q7. How many weeks are in a year?
A year has 52 weeks and 1 extra day (or 2 extra days in a leap year).
Q8. Why does February have fewer days?
February has 28 days (29 in leap years). This comes from the ancient Roman calendar, where February was the last month and received the fewest days.
Q9. How do I remember which months have 30 or 31 days?
Use the rhyme: '30 days has September, April, June, and November. All the rest have 31, except February alone.' You can also use the knuckle method — knuckles are 31-day months, dips are 30-day months.
