Doubles and Near Doubles

Doubles (3+3, 4+4, etc.) are among the easiest facts to memorize and serve as anchors for deriving near-double facts (3+4 = double 3 + 1).

• Framework: Montessori
• Unit: Mathematics
• Learning area: Number Concepts
• Level: Ages 4-6

Objectives

• Memorize double facts
• Use doubles as addition strategy
• Build mental math skills

Materials

• Bead bars (pairs of same color)
• Mirror
• Recording sheet
• Double dominoes

Instructions

1. Place 4-bar. Place another 4-bar beside it. 2. 'Double 4 is 8.' Mirror shows reflection. 3. Record: 4 + 4 = 8. 4. Work through all doubles 1-10. 5. Near doubles: '4 + 5 is double 4 plus 1 more.' 6. Practice strategy with various near doubles.

Educator tip

A mirror alongside the bead bar visually demonstrates 'doubling.' Children love this visual connection.

Assessment

Child recalls all doubles to 10 and uses near-doubles strategy.

More from Mathematics

• Making Ten Strategy
• Measuring Length with Non-Standard Units
• Measuring with Rulers
• Weighing and Comparing Mass
• Telling Time: Hours and Half Hours
• Calendar and Date Concepts
• Geometric Solids
• Constructive Triangles: First Box