Concise Pre Algebra: Learn Algebra Basics in This Easy to Understand Algebra Workbook Style Textbook | Detailed Lessons and Over 50 Practice Problems with Solutions by Josiah Coates

Author:Josiah Coates [Coates, Josiah]
Language: eng
Format: epub
Published: 2018-09-29T00:00:00+00:00

18. Solve the problem below:

Since we are subtracting with different denominators, the first step is to find the least common multiple of each denominator:

3: 3, 6, 9, 12, 15, 18, 21

7: 7, 14, 21, 28, 35, 42

Therefore, the new denominator is 21. Now we must convert 2/3 to the new fraction:

First divide the “new” denominator by the “old” denominator:

Now we cross multiply this answer by the “old” numerator:

The new numerator is 14, therefore:

Now to calculate the new numerator for 3/7:

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