Years

A year is a unit of time that is approximately equal to the length of time it takes for the Earth to complete one orbit around the sun. This period of time is measured in 365 days, 5 hours, 48 minutes, and 45 seconds. To keep our calendar aligned with the Earth's orbit, we add an extra day to the calendar every four years, creating a leap year with 366 days.

In the Gregorian calendar, which is the most widely used calendar system today, a year is divided into 12 months. The months have varying numbers of days, with the longest months having 31 days and the shortest having 28 or 29 days in the case of February during a leap year.

Years are commonly used to measure the age of individuals, the duration of historical events, and the passage of time in general. They are also used in various calculations, such as determining the interest accrued over a certain number of years in finance, or calculating the average annual temperature in meteorology.

Understanding the concept of years is important for various mathematical and scientific calculations, as well as for everyday activities such as planning events, scheduling appointments, and keeping track of personal milestones.

◂Math Worksheets and Study Guides Third Grade. Determine Appropriate Standard of Units

Study Guide

Determine Appropriate Standard of Units

Worksheet/Answer key

Determine Appropriate Standard of Units

Worksheet/Answer key

Determine Appropriate Standard of Units

Worksheet/Answer key

Determine Appropriate Standard of Units

The resources above cover the following skills:

Measurement (NCTM)

Understand measurable attributes of objects and the units, systems, and processes of measurement.

Understand such attributes as length, area, weight, volume, and size of angle and select the appropriate type of unit for measuring each attribute.

Understand the need for measuring with standard units and become familiar with standard units in the customary and metric systems.

Understand that measurements are approximations and how differences in units affect precision.

Apply appropriate techniques, tools, and formulas to determine measurements.

Select and apply appropriate standard units and tools to measure length, area, volume, weight, time, temperature, and the size of angles.

Connections to the Grade 3 Focal Points (NCTM)

Measurement: Students in grade 3 strengthen their understanding of fractions as they confront problems in linear measurement that call for more precision than the whole unit allowed them in their work in grade 2. They develop their facility in measuring with fractional parts of linear units. Students develop measurement concepts and skills through experiences in analyzing attributes and properties of two-dimensional objects. They form an understanding of perimeter as a measurable attribute and select appropriate units, strategies, and tools to solve problems involving perimeter.