Cool Math
Coolmath: Gcf's and Lcm's Least Common Multiple
These prealgebra-arithmetic lessons explains greatest common factors (GCF's) and least common multiples (LCM's) and shows how to find them.
Math Planet
Math Planet: Finding the Least Common Multiple
Gain an understanding of the least common multiple by viewing an example and a video lesson.
Shmoop University
Shmoop: Basic Operations: Lcm & Gcf
Students learn about the least common multiple and the greatest common factor. The resource consists of notes, step-by-step examples, and practice problems with solutions.
Elias Saab
Math Drills: Lcm and Gcd Quiz
An interactive quiz which provides students with two numbers and asks them to find either the Least Common Multiple or the Greatest Common Divisor between them. Students input their solution and have the program evaluate it. Hints are...
Better Lesson
Better Lesson: Lcm Stations Activity
Learning about factors and multiples allows students to see number relationships and apply those number relationships to multiplication and division.
That Quiz
That Quiz: Factores
Interactive practice tests dealing with factors. Students will practice the prime factors, greatest common factor and least common multiple.
Cuemath
Cuemath: Highest Common Factor
Explore the world of Highest Common Factor or Greatest Common Factor (GCF) by going through its various aspects and properties. Find answers to questions like what is the highest common factor for a group of numbers, easy ways to...
Math Slice
Math Slice: Least Common Multiple: Math Worksheets
This tool allows you to create worksheets where students must find the lowest common factor in a set of two to four whole numbers.
SMART Technologies
Smart: Factors and Multiples
Students are introduced to prime numbers, composite numbers, prime factorization, greatest common factor, and least common multiple in this SMART whiteboard activity.
University of Waterloo (Canada)
University of Waterloo: Cemc: Math Circles: Number Theory Ii [Pdf]
This worksheet provides a series of problem-solving questions that require higher order thinking skills. Questions will include finding the greatest common divisor, and least common multiple.
Texas Instruments
Texas Instruments: Oliver's Method
Students discover a relationship between the Greatest Common Factor (GCF) and the Least Common Multiple (LCM) of two numbers. Students will find and justify the relationship that the product of two numbers is equal to the product of the...
Varsity Tutors
Varsity Tutors: Hotmath: Graphing Calculator Practice Problems Number Theory
Practice using your graphing calculator for number theory problems, including prime factorization, greatest common factor, least common multiple, and scientific notation. If you get stumped or if you would like to check your work, then...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Greatest Common Factors, Least Common Multiples
Math Forum response to request for info on how to find greatest common factors, and how this compares to least common multiples. Explanation includes examples of each.
McGraw Hill
Glencoe: Self Check Chapter Test Fractions and Decimals
Students are assessed on fractions and decimals. Topics include greatest common factor, improper fractions, and fractions as decimals. The self-checking test includes hints and solutions.
Amby Duncan-Carr
Greatest Common Factor/online Lesson
A complete lesson on Greatest Common Factors, including methods of finding, examples, and a practice multiple-choice quiz.
PBS
Pbs Learning Media: Pizza Toppings
This Cyberchase video features Bianca who uses Venn Diagrams to make a pizza that satisfies the topping preferences of her friends.
Doina Popovici
Math Play: Factors and Multiples Game
A jeopardy style game that students can play with others or alone to practice their skills at identifying multiples and factors.
Khan Academy
Khan Academy: Factor With the Distributive Property
Practice applying the distributive property to factor numerical expressions (no variables). Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Illustrative Mathematics
Illustrative Mathematics: 6.ns Adding Multiples
This task will provide insight to teachers on students' level of understanding when reasoning about a problem. The task asks students to examine whether the sum of two numbers that are multiples of 6 produces another multiple of 6....
Illustrative Mathematics
Illustrative Mathematics: Picturing Factors in Different Orders
The purpose of this task is to help learners picture the multiplicative structure of the number 30 in different ways. Some of this structure is easier to communicate using grouping symbols, as it is easier to interpret...
University of Vienna (Austria)
University of Vienna: Pulling Common Factors Out
Multiple choice assessment which tests knowledge of "simple" factoring (greatest common factor only), given varying degrees of polynomials.
Other
Sierra College: Elementary Algebra Review Sheet and Common Formulas
This review sheet includes important rules, properties, formulas, and equations needed to solve many Algebra problems.
Khan Academy
Khan Academy: Greatest Common Factor
Find the greatest common factor of 2 or 3 integers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Factors & Divisibility
Students practice multiple-choice problems with factors and divisibility.