Book 2:
Adding and Subtracting Fractions You Will
Book 2:
Adding and Subtracting Fractions
You Will
Learn a shortcut for adding fractions with numerators of 1
Add fractions with unlike denominators
Subtract common fractions
Use the general case method
Subjects
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Chapter 1 |
Chapter 2 |
Chapter 3 |
Chapter 4 |
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Video Highlights
Martha learns an alternative way to add certain kinds of fractions. She becomes a “number detective” to add and subtract fractions.
Summary/Terminology
Finding a common denominator by multiplying the original denominators together.
Finding the numerator by cross multiplying the fractions and adding the products together.
Addition Formula:
A + C= (AD) + (CB)
B D BD
Subtraction Formula:
A - C= (AD) - (CB)
B D BD
Cross multiplication
Product
General case statement