Fourth and fifth graders make factor trees for a set of six numbers, even and odd. Numbers used are: 14, 20, 44, 52, 66 and 81.
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Number and Operations: Primes, Composites and Common Factors
Incorporate riddles into your math lesson by having students make tree factors and determine if the number is a prime or composite. They will also use other clues to find the answer to the riddle while sharpening their multiplication...
4th - 5th Math CCSS: Adaptable
How Do You Find GCF and LCM?
Using the numbers 225 and 270, the narrator explains how to find the greatest common factor and the least common multiple. This presentation could be used in conjunction with other videos in a series exploring how to identify prime...
6 mins 4th - 5th Math CCSS: Adaptable
Study Jams! Greatest Common Factor
When one method isn't enough to teach GCF, try two! This interactive webpage introduces factors and the prime factor tree to find the greatest common factor of two numbers. After the lesson, have learners click to try the two examples...
5th - 8th Math CCSS: Adaptable