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character: Number Ninja
topic: Using Benchmarks to Estimate Sums and Differences
grade: 4
subject: Mathematics
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character: Math Wizard
topic: Approximating with Benchmarks
grade: 4
subject: Mathematics
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character: Estimation Expert
topic: Rounding Numbers for Easier Calculations
grade: 4
subject: Mathematics
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character: Calculation Coach
topic: Using Benchmarks in Everyday Math
grade: 4
subject: Mathematics
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