Gregorian Calendar Study Guide
Key Concepts
- History: The transition from the Julian to the Gregorian calendar
- Leap Years: Rules for determining leap years in the Gregorian calendar
- Months: Names and lengths of each month in the Gregorian calendar
- Weeks and Days: The structure of weeks and days in the Gregorian calendar
Practice Questions
- What was the primary reason for the introduction of the Gregorian calendar?
- Identify the leap years in the interval from 2000 to 2020.
- How many days are there in February in a leap year?
- List the months that have 31 days.
- Explain the significance of the adjustment made to the leap year rule in the Gregorian calendar.
Activities
1. Create a calendar for a leap year, highlighting the extra day in February.
2. Research and share the historical context of the transition to the Gregorian calendar.
3. Discuss the importance of having a standard calendar system for global communication and organization of time.
.◂Math Worksheets and Study Guides Fourth Grade. Algebra
Study Guide
Algebra 
Worksheet/Answer key
Algebra Worksheet/Answer key
Algebra Worksheet/Answer key
Algebra Worksheet/Answer key
Algebra Basics
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Number and Operations (NCTM)
Understand numbers, ways of representing numbers, relationships among numbers, and number systems.
Understand the place-value structure of the base-ten number system and be able to represent and compare whole numbers and decimals.
Algebra (NCTM)
Use mathematical models to represent and understand quantitative relationships.
Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.