Gregorian Calendar
The Gregorian calendar is the calendar used in most of the world today. It was introduced by Pope Gregory XIII in 1582 as a refinement of the Julian calendar. The Gregorian calendar is a solar calendar with 12 months, and it is the calendar system used for civil purposes.
Key Features of the Gregorian Calendar:
- Leap Years: The Gregorian calendar accounts for leap years, adding an extra day to the month of February every 4 years, except for years that are divisible by 100 but not by 400.
- Months: The calendar has 12 months, with varying lengths. The months are January, February, March, April, May, June, July, August, September, October, November, and December.
- Weekdays: The calendar has 7 days in a week, named Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday.
Study Guide Questions:
- What is the Gregorian calendar and when was it introduced?
- How does the Gregorian calendar account for leap years?
- What are the names of the 12 months in the Gregorian calendar?
- How many days are there in a week according to the Gregorian calendar?
Answers:
- The Gregorian calendar is the calendar used in most of the world today. It was introduced by Pope Gregory XIII in 1582 as a refinement of the Julian calendar.
- The Gregorian calendar accounts for leap years by adding an extra day to the month of February every 4 years, except for years that are divisible by 100 but not by 400.
- The names of the 12 months in the Gregorian calendar are January, February, March, April, May, June, July, August, September, October, November, and December.
- There are 7 days in a week according to the Gregorian calendar.
◂Math Worksheets and Study Guides Seventh Grade. Introduction to Probability
Study Guide
Introduction to Probability 
Worksheet/Answer key
Introduction to Probability Worksheet/Answer key
Introduction to Probability Worksheet/Answer key
Introduction to Probability Worksheet/Answer key
Introduction to Probability
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Data Analysis and Probability (NCTM)
Understand and apply basic concepts of probability
Use proportionality and a basic understanding of probability to make and test conjectures about the results of experiments and simulations.
Connections to the Grade 7 Focal Points (NCTM)
Probability: Students understand that when all outcomes of an experiment are equally likely, the theoretical probability of an event is the fraction of outcomes in which the event occurs. Students use theoretical probability and proportions to make approximate predictions.