We use the greatest common factor (GCF) to simplify fractions when we find sums, differences, and products of fractions. We use the least common multiple (LCM) of the denominators of fractions to add and subtract fractions. To multiply two fractions, we multiply the numerators to each other and then we multiply the denominators to each other. Then we write the product in simplest form. We can avoid simplifying if we use GCF first, as cross-cancellation. We show several examples of multiplying straight across using simplifying vs cross-cancellation. We can multiply a fraction by a whole number by writing the whole number with 1 as its denominator.
6th Grade Math 2.1a, Understand and Find Greatest Common Factors
https://youtu.be/qk-gJ3dMglI
6th Grade Math 2.2, Least Common Multiple
https://youtu.be/OjbJssQpsTk
6th Grade Math Course
https://www.youtube.com/playlist?list=PLKi4WTp6PRGWg5McSxYODb2Oqvtt8AM5s
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Textbook to use:
Publisher : HOUGHTON MIFFLIN HARCOURT; Student edition (May 4, 2017)
Language: : English
Paperback : 632 pages
ISBN-10 : 1328761053
ISBN-13 : 978-1328761057
Item Weight : 3.26 pounds
Dimensions : 8.5 x 1.4 x 10.8 inches
This book may be purchased through many different online sellers.
Just search "Go Math Grade 6 2018".
Make sure you have one large textbook or the two-volume set. If the
cover says "Volume 1", then you will also need "Volume 2".