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Calendar Reasoning - Beginner-Intermediate Level: odd days BEGINNER-INTERMEDIATE

This deep dive ★ worksheet contains 20 beginner-intermediate-level calendar reasoning problems. Worksheet 11 of 30 focuses on odd days. Practice leap year logic, month patterns, weekday determination with our step-by-step solutions. Difficulty: building on fundamentals with moderate challenges. Recommended for developing learners.

📝 Worksheet 11 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner-intermediate level

What you'll learn in this worksheet:
Your progress through Calendar Reasoning
Worksheet 11 of 30 (36% complete)

Question 1

In the calendar for Apr 2021, if the 1st falls on a Thursday, on which weekday will the 15th fall?
15th is 14 days later: (3+14)%7=3, so Thursday.
grid, position

Question 2

If tomorrow is not Friday, which day CANNOT be today?
If today were Thursday, then tomorrow would be Friday, which contradicts the condition.
conditional, logic

Question 3

In 2015, on which date does Easter Sunday fall?
Easter Sunday in 2015 falls on April 5.
festival, holiday

Question 4

Which financial quarter and semester does 14-02-2034 fall in? (Note: Indian fiscal year starts April 1, where April-May-June = Q1/Semester 1, July-Aug-Sep = Q2/Semester 1, Oct-Nov-Dec = Q3/Semester 2, Jan-Feb-Mar = Q4/Semester 2)
For 14-02-2034: Fiscal Year 2033-2034, Quarter 4, Semester 2.
fiscal, quarter, semester

Question 5

If yesterday was not Wednesday, which day CANNOT be today?
If today were Thursday, then yesterday would be Wednesday, which contradicts the condition.
conditional, logic

Question 6

How many days did February have in the year 2011?
Year 2011 had 28 days in February.
leap-year, month

Question 7

In the following calendar grid for April 2030, how many Thursdays are there? Mon Tue Wed Thu Fri Sat Sun 1 | 2 | 3 | 4 | 5 | 6 | 7 8 | 9 | 10 | 11 | 12 | 13 | 14 15 | 16 | 17 | 18 | 19 | 20 | 21 22 | 23 | 24 | 25 | 26 | 27 | 28 29 | 30 | | | | |
In April 2030, Thursdays fall on: 4, 11, 18, 25. Total: 4.
grid, visual

Question 8

If 1 January 2022 was a Saturday, what day was 1 February 2022?
Calculated via Zeller's congruence: 1/2/2022 falls on Tuesday.
date, sequence

Question 9

How many odd days are there in 52 years starting from 1921? (Note: Odd days = remainder when total days are divided by 7)
Total days = 39×365 + 13×366 = 18993 days. Odd days = 18993 mod 7 = 2.
odd-days, span

Question 10

In England, when switching from the Julian to the Gregorian calendar in 1752, September 2 (Julian) was followed directly by which date in the Gregorian calendar?
England switched to the Gregorian calendar after 2 September 1752, skipping 11 days to align with the solar year. Therefore, 3 September became 14 September.
conversion, historical

Question 11

In 2020, on which date does Easter Sunday fall?
Easter Sunday in 2020 falls on April 12.
festival, holiday

Question 12

If 1 January 2021 was a Friday, what day was 1 July 2021?
Calculated via Zeller's congruence: 1/7/2021 falls on Thursday.
date, sequence

Question 13

In the following calendar grid for December 2021, how many Mondays are there? Mon Tue Wed Thu Fri Sat Sun | | 1 | 2 | 3 | 4 | 5 6 | 7 | 8 | 9 | 10 | 11 | 12 13 | 14 | 15 | 16 | 17 | 18 | 19 20 | 21 | 22 | 23 | 24 | 25 | 26
In December 2021, Mondays fall on: 6, 13, 20. Total: 3.
grid, visual

Question 14

In 2029, on which date does Easter Sunday fall?
Easter Sunday in 2029 falls on April 1.
festival, holiday

Question 15

If yesterday was Thursday and tomorrow is Saturday, what day is today?
Using day relationships: If yesterday was Thursday and tomorrow is Saturday, = today? Friday
weekday, sequence

Question 16

How many odd days are there in 400 years starting from 1983? (Note: Odd days = remainder when total days are divided by 7)
Total days = 303×365 + 97×366 = 146097 days. Odd days = 146097 mod 7 = 0.
odd-days, span

Question 17

After how many years will the calendar for 2018 repeat exactly?
The calendar for 2018 repeats after 11 years because the day pattern and leap year cycle align.
calendar-cycle, repeat

Question 18

How many odd days are there in 400 years starting from 1811? (Note: Odd days = remainder when total days are divided by 7)
Total days = 303×365 + 97×366 = 146097 days. Odd days = 146097 mod 7 = 0.
odd-days, span

Question 19

How many odd days are there in 100 years starting from 1931? (Note: Odd days = remainder when total days are divided by 7)
Total days = 75×365 + 25×366 = 36525 days. Odd days = 36525 mod 7 = 6.
odd-days, span

Question 20

In England, when switching from the Julian to the Gregorian calendar in 1752, September 2 (Julian) was followed directly by which date in the Gregorian calendar?
England switched to the Gregorian calendar after 2 September 1752, skipping 11 days to align with the solar year. Therefore, 3 September became 14 September.
conversion, historical
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