Negative Numbers for Kids: How Numbers Go Below Zero

The story of negative numbers for kids: numbers below zero, from Chinese counting rods about 2,000 years ago to Brahmagupta's rules in India in 628 CE.

• How Chinese mathematicians used red and black rods in The Nine Chapters
• Why many European mathematicians refused them, and one called them absurd in 1544
• Where negative numbers live today, from thermometers to lift buttons
• Quiz questions to answer along the way

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