Adding/Subtracting Fractions with Same/Related Denominators (5)

Investigate strategies to solve problems involving addition and subtraction of fractions with the same denominator (ACMNA103)

LO: To add or subtract fractions with related denominators.
Know:

  • how to add numbers
  • simple vocabulary (morning, afternoon, evening)

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.

Do:

  • I can add and subtract fractions with the same or related denominator

When adding fractions with the same/related denominators, all you have to do is add the numerators.

The reason why you keep the denominators the same is because the total size of the pieces (denominator) never changes.

When subtracting fractions with the same/related denominators, all you have to do is subtract the numerators.

The reason why you keep the denominators the same is because the total size of the pieces (denominator) never changes.

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