### Standard 5: Estimation

In grades K-4, the curriculum should include estimation so students can:
• Explore estimation strategies
• Recognize when an estimate is appropriate
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Benchmarks 9A (The Mathematical World: Numbers)
It is possible (and often useful) to estimate quantities without knowing them exactly.

Benchmarks 9D (The Mathematical World: Uncertainty)
Statistical predictions (as for rainy days, accidents) are typically better for what proportion of a group will experience something than for which members of the group will experience it and better for how often something will happen than for exactly when.

• Determine the reasonableness of an estimate
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Benchmarks 12B (Habits of Mind: Computation and Estimation)
Make quantitative estimates of familiar lengths, weights, time intervals and check them by measurements.

Benchmarks 12B (Habits of Mind: Computation and Estimation)
Readily give the sums and differences of single-digit numbers in familiar contexts where the operation makes sense and they can judge the reasonableness of the answer.

• Apply estimation in working with quantities, measurement, computation, and problem solving
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Benchmarks 12B (Habits of Mind: Computation and Estimation)