🌉 Bridge · Ages 11–13 · pre-algebra

Pre-Algebra

The bridge from arithmetic to algebra. Go below zero, break numbers into primes, mix paint in ratios, and solve for the unknown $x$ with the balance method invented by al-Khwarizmi.

📚 4 lessons 61 min 200 XP

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Lessons

1🌡️Negative numbersBelow zero: temperatures, debts and the rules of signs.⏱ 15 min✨ 50 XP
2🔢Primes and factorsThe atoms of arithmetic, and how they protect your messages online.⏱ 15 min✨ 50 XP
3🎨Ratios, proportions and percentagesRecipes, maps, speeds and discounts all follow the same idea.⏱ 15 min✨ 50 XP
4⚖️Variables and equationsFind the unknown $x$ with al-Khwarizmi's balance method.⏱ 16 min✨ 50 XP