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10 cards from this deck
Systematic approach to simplify numbers and make calculations easier, not wild guessing
Rounding skills
1 or 2 significant figures
Estimating has systematic method; guessing doesn't
ฯโ3\pi \approx 3ฯโ3
Find perfect squares on either side of the number
Determine which perfect square it's closer to
87โ9.3\sqrt{87} \approx 9.387โโ9.3 (between 9 and 10, closer to 9)
Show all working clearly, especially rounding steps
Manageable calculations while maintaining reasonable accuracy
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