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STILLWATER CROSSING · THE COURSE NOTES · BRIDGE MATH 5/6

Week 10 · Adding and Subtracting Unlike Fractions

This week
Lessons 46, 47, 48, 49 & 50
Papers
Test 5 to do at home
Method
No calculators, ever · show every step
Note-Taking Tip: Try teaching someone else from your notes. Are they organized, complete and understandable to another person?
Instructional notes

Adding/Subtracting with Unlike Denominators:

To add or subtract fractions with unlike denominators: • Find the LCD • Change to equivalent fractions using the LCD • Add or subtract • Simplify if needed

*If adding or subtracting mixed numbers, add or subtract the fractions before the whole numbers.

Example

Add or subtract. Simplify if possible.

worked example from the course notes
Practice

Add or subtract. Simplify if possible.

worked example from the course notes
worked example from the course notes
Instructional notes

Borrowing with Fractions A fraction or mixed number can be rewritten by borrowing 1 from the whole number and writing that 1 as a fraction with the same numerator and denominator. When there is already a fraction part, add the original fraction to the borrowed fraction.

Example

Write the missing number.

worked example from the course notes
Practice

Write the missing numbers.

worked example from the course notes
worked example from the course notes

Quick Review

Find the greatest common factor of 24 and 48. 24

worked example from the course notes

3 + 42 ÷ (29-21) × 2 = 7

Homework this week
Work-textLesson 46Lesson 47Lesson 48Lesson 49Lesson 50
Speed drill46474850

Terms on the record

TermMeaning
numeratorthe same numerator and denominator. When there is already a
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