Introduction to Negative Numbers

Montessori children are ready for negative numbers—the concept connects to temperature (below zero), floors below ground, and the number line.

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

Objectives

• Understand numbers below zero
• Use number line extending left of zero
• Connect to temperature and elevation

Materials

• Number line -10 to 10
• Thermometer
• Elevator diagram
• Counters

Instructions

1. Present number line 0-10. 'What's to the left of zero?' 2. Extend to show -1, -2, -3... 3. Temperature context: 'In winter, it can be -5°C. That's 5 degrees below zero.' 4. Elevator: 'The parking garage is on floor -2.' 5. Walk the number line: '3 steps back from 1 puts you at -2.'

Educator tip

Temperature is the most intuitive context for negative numbers. Use a large thermometer visual.

Assessment

Child identifies negative numbers and uses them in context (temperature, elevator).

More from Mathematics

• Multiplication as Arrays
• Introduction to Elapsed Time
• Subtraction as Finding the Difference
• Cube Chains and Square Numbers
• Introduction to Simple Equations
• Mathematical Journal Writing
• Montessori Math Fair Projects
• Number Rods