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Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
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negative numbers as objects
by chas3142
Maths Teaching Resources
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2008-08-02 20:50:36
by chas3142
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