Rounding to Nearest Ten

Rounding connects to estimation and mental math, teaching children to simplify numbers for quick calculations and reasonable approximations.

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

Objectives

• Round two-digit numbers to nearest ten
• Understand rounding rules
• Apply rounding to estimation

Materials

• Number line 0-100
• Numeral cards
• Rounding decision cards
• Recording sheet

Instructions

1. Present number 37 on number line. 2. 'Which ten is 37 closest to? 30 or 40?' 3. Count: 37 is 7 away from 30 but only 3 away from 40. 4. '37 rounds to 40.' 5. Rule: 'If the units digit is 5 or more, round up.' 6. Practice with various numbers. 7. Apply: '38 + 42 is about 40 + 40 = 80.'

Educator tip

The number line makes rounding visual. Children can see which ten is closer without memorizing rules.

Assessment

Child rounds numbers to the nearest ten and applies to estimation problems.

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