Adding Fractions with Like Denominators

Adding like fractions concretely shows that we are combining parts of the same size, making the algorithm meaningful rather than memorized.

• Framework: Montessori
• Unit: Mathematics
• Learning area: Fractions
• Level: Ages 5-6

Objectives

• Add fractions with same denominators
• Understand that numerators add while denominator stays
• Use concrete materials for fraction addition

Materials

• Fraction circles
• Fraction equation cards
• Recording sheet

Instructions

1. Present: 1/4 + 2/4. 2. Place 1/4 piece on mat. 3. Add 2/4 pieces. 4. 'How much do we have? Three fourths.' 5. Record: 1/4 + 2/4 = 3/4. 6. Try 2/5 + 1/5. 7. Discuss: 'Why does the bottom number stay the same?'

Educator tip

Relate to everyday language: 'One quarter plus two quarters equals three quarters—just like money!'

Assessment

Child adds like fractions using circles and records equations.

More from Mathematics

• Fractions of a Set
• Greater Than, Less Than
• Ordering Numbers to 100
• Number Bonds to 10
• Doubles and Near Doubles
• Making Ten Strategy
• Measuring Length with Non-Standard Units
• Measuring with Rulers