Line
A line is a straight path that extends infinitely in opposite directions. It is made up of an infinite number of points and has no thickness. In geometry, a line is typically represented by a straight line with arrowheads at each end to indicate that it extends indefinitely.
There are different types of lines, including:
- Straight Line: A line that does not curve or bend.
- Horizontal Line: A line that runs from left to right, parallel to the horizon.
- Vertical Line: A line that runs from top to bottom, perpendicular to the horizon.
In mathematics, lines are often described using their equations, such as the slope-intercept form (y = mx + b) or the point-slope form (y - y1 = m(x - x1)). These equations help us understand the position and direction of a line on a graph.
Understanding lines and their properties is fundamental in many areas of mathematics, including geometry, algebra, and calculus.
.◂Math Worksheets and Study Guides Third Grade. 3 Digit Subtraction
Study Guide
3 Digit Subtraction 
Worksheet/Answer key
3 Digit Subtraction Worksheet/Answer key
3 Digit Subtraction Worksheet/Answer key
3 Digit Subtraction
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Number and Operations (NCTM)
Compute fluently and make reasonable estimates.
Develop fluency in adding, subtracting, multiplying, and dividing whole numbers.
Select appropriate methods and tools for computing with whole numbers from among mental computation, estimation, calculators, and paper and pencil according to the context and nature of the computation and use the selected method or tools.
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.
Connections to the Grade 3 Focal Points (NCTM)
Number and Operations: Building on their work in grade 2, students extend their understanding of place value to numbers up to 10,000 in various contexts. Students also apply this understanding to the task of representing numbers in different equivalent forms (e.g., expanded notation). They develop their understanding of numbers by building their facility with mental computation (addition and subtraction in special cases, such as 2,500 + 6,000 and 9,000 - 5,000), by using computational estimation, and by performing paper-and-pencil computations.