Introduction to Domain and Range
1 Hook - Bootstrap Hour of Code Tutorial
2 Direct Instruction - Introduce Domain and Range
The class should already be setup in Bootstrap (with WeScheme), and should have worked through Unit 1, which gives a more thorough introduction to Bootstrap.
Before beginning Unit 2, use Nearpod to introduce and/or review the concepts of domain and range. The free version of Nearpod allows for added interactivity in regular presentations, and it is a great way to introduce a topic and create built-in formative assessment.
Guided practice can also be built into this phase of the lesson by adding questions in Nearpod and walking through examples in Bootstrap.
3 Independent Practice - Identifying Domain and Range of Mathematical and Programming Funcitons
The Bootstrap website includes worksheets designed to help kids further develop and practice concepts taught in the lessons.
Specifically, the section on definitions allows students to practice writing functions and explicitly state the domain and range of each.
4 Wrap-up with Kahoot
Either search for existing Kahoots to review domain and range, or you can create your own. Creating your own will allow you to incorporate elements and applications of domain and range introduced in Bootstrap.
Key Standards Supported
Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output.1
Compare properties of two functions each represented in a different way (algebraically, graphically, numerically in tables, or by verbal descriptions). For example, given a linear function represented by a table of values and a linear function represented by an algebraic expression, determine which function has the greater rate of change.
Interpret the equation y = mx + b as defining a linear function, whose graph is a straight line; give examples of functions that are not linear. For example, the function A = s2 giving the area of a square as a function of its side length is not linear because its graph contains the points (1,1), (2,4) and (3,9), which are not on a straight line.
Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the function from a description of a relationship or from two (x, y) values, including reading these from a table or from a graph. Interpret the rate of change and initial value of a linear function in terms of the situation it models, and in terms of its graph or a table of values.
Describe qualitatively the functional relationship between two quantities by analyzing a graph (e.g., where the function is increasing or decreasing, linear or nonlinear). Sketch a graph that exhibits the qualitative features of a function that has been described verbally.
Understand that a function from one set (called the domain) to another set (called the range) assigns to each element of the domain exactly one element of the range. If f is a function and x is an element of its domain, then f(x) denotes the output of f corresponding to the input x. The graph of f is the graph of the equation y = f(x).
Use function notation, evaluate functions for inputs in their domains, and interpret statements that use function notation in terms of a context.
Recognize that sequences are functions, sometimes defined recursively, whose domain is a subset of the integers. For example, the Fibonacci sequence is defined recursively by f(0) = f(1) = 1, f(n+1) = f(n) + f(n-1) for n ≥ 1.
For a function that models a relationship between two quantities, interpret key features of graphs and tables in terms of the quantities, and sketch graphs showing key features given a verbal description of the relationship. Key features include: intercepts; intervals where the function is increasing, decreasing, positive, or negative; relative maximums and minimums; symmetries; end behavior; and periodicity.★
Relate the domain of a function to its graph and, where applicable, to the quantitative relationship it describes. For example, if the function h(n) gives the number of person-hours it takes to assemble n engines in a factory, then the positive integers would be an appropriate domain for the function.★
Calculate and interpret the average rate of change of a function (presented symbolically or as a table) over a specified interval. Estimate the rate of change from a graph.★