WEBINAR Feb 05, 2022: Math Kangaroo Multiples, factors, and divisibility for Grades 5-6-Presentation Recording

Video Transcription

Video Summary

In the Math Kangaroo webinar led by Dr. Sarah Sagee, participants explored the concepts of factors, multiples, and divisibility in preparation for the Math Kangaroo contest. Dr. Sagee emphasized a four-step problem-solving strategy: understanding the problem, making a plan, carrying out the plan carefully, and checking the answer. Participants were cautioned against using calculators as they are not permitted in the contest.<br /><br />Throughout the session, various problems were tackled, including determining how many numbers are divisible by both two and seven, finding the least common multiple for scheduling problems, and calculating the number of factors for a given number using prime factorization. Dr. Sagee demonstrated multiple methods to solve these problems, highlighting that there can be more than one correct approach.<br /><br />Maya, the teaching assistant, aided in moderating the chat and answering questions, ensuring attendees could resolve doubts. The workshop incorporated interactive polls and quizzes to engage participants, simulating a real contest scenario.<br /><br />An example problem involved determining the number of five-digit numbers of the form 1, <em>, 8, 2, </em> that are divisible by 12 and composed of unique digits. Participants used the rules for divisibility by 3 (sum of digits) and by 4 (last two digits) to find suitable number combinations. Another complex problem focused on organizing marbles into boxes with the most divisors, illustrating the application of the greatest common divisor in optimization.<br /><br />The session concluded with encouragement to utilize the strategies learned, reminding participants to collect feedback via a survey and thanking Maya for her assistance.

Keywords

Math Kangaroo

factors

multiples

divisibility

problem-solving

least common multiple

prime factorization

divisors

interactive quizzes

greatest common divisor