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Add Fractions with Unlike Denominators

This topic covers the concept involved in addition of two or more fractions with unlike denominators using common denominators and representation in patterns and blocks.

Topic: Add Unlike Fractions

  • When adding unlike fractions, find equivalent fractions with a common denominator (like fractions)

  • A common denominator can be obtained by multiplying both the denominators

  • To add like fractions, add the numerators and retain the denominator

  • Express the sum in its simplest form by dividing the numerator and the denominator by the greatest common fraction (GCF)

Topic: Add Using Clock Fractions

  • A clock face can be used to model fractions with 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 in the denominator

  • 1 hour = 60 minutes

  • Any fraction can be converted to minutes and represented in the clock face

  • Similarly any measure of clock face can be represented as a fraction

  • To add two fractions, one can add the equivalent clock face representations and represent their sum as a fraction

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