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 solve problems involving fractions with the same or related denominators.

Know:

  • the structure of a fraction.

  • what a numerator in a fraction represents.

  • what a denominator in a fraction represents.

  • how to add and subtract numbers.

Understand:

  • that fractions have individual values and can be placed on a number line.

  • that fractions with larger denominators do not mean that they are larger in size.

  • when adding or subtracting fractions the denominator always remains the same because the size of the whole does not change.

Do:

  • I can solve problems involving fractions with the same or related denominators.

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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