Adding/Subtracting Fractions with Different/Unrelated Denominators

Solve problems involving addition and subtraction of fractions, including those with unrelated denominators (ACMNA153)

LO: To add or subtract fractions with unrelated denominators.

Know:

  • how to add/subtract numbers

Understand:

  • that the addition of fractions makes the fractions larger
  • that the subtraction of fractions makes the fractions smaller
  • that when adding/subtracting fractions, you have to keep the denominator the same. If they are different you have to make them the same prior to proceeding.

Do:

  • I can add and subtract fractions with different/unrelated denominators

Visual Representations

Notes

Adding/Subtracting Fractions with Unrelated Denominators

When adding fractions with the different/unrelated denominators, you have to make the denominators the same before proceeding.

When subtracting fractions with the different/unrelated denominators, you have to make the denominators the same before proceeding.

Butterfly Method

Teaching Ideas

Adding/Subtracting Fractions Videos

Textbook Questions

My Maths 7

Exercise 2C pg. 79 Q. 3-4, 6-9

 

My Maths 8

Exercise 1D pg. 23 Q. 1

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