Introduction to Simple Equations

Simple equations with missing numbers introduce algebraic thinking naturally, using the balance metaphor to make equality concrete.

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

Objectives

• Solve for unknown quantities
• Understand the equals sign as balance
• Build algebraic thinking

Materials

• Balance scale
• Weights
• Equation cards with missing numbers
• Bead bars

Instructions

1. Balance scale: place 5 on one side, 3 + ? on other. 2. 'What makes it balance? 3 + 2 = 5.' 3. Write: 3 + = 5. 4. 'The box means a missing number.' 5. Solve with bead bars: 'I need 2 more to make 5.' 6. Try: + 4 = 7, 8 - = 3. 7. Use fact families to solve.

Educator tip

The balance scale makes equality physical. Children understand that both sides must have the same value.

Assessment

Child solves missing number equations using multiple strategies.

More from Mathematics

• Mathematical Journal Writing
• Montessori Math Fair Projects
• Number Rods
• Sandpaper Numerals
• Spindle Boxes
• Cards and Counters
• Introduction to the Decimal System with Golden Beads
• Teen Board (Seguin Board A)