### Standard 8: Whole Number Computation

In grades K-4, the curriculum should develop whole number computation so that students can:
• Model, explain, and develop reasonable proficiency with basic facts and algorithms
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.

Benchmarks 12B (Habits of Mind: Computation and Estimation)
Explain to other students how they go about solving numerical problems.

Benchmarks 12B (Habits of Mind: Computation and Estimation)
State the purpose of each step in a calculation.

• Use a variety of mental computation and estimation techniques
• Benchmarks 12B (Habits of Mind: Computation and Estimation)
Add, subtract, multiply, and divide whole numbers mentally, on paper, and with a calculator.

• Use calculators in appropriate computational situations

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Benchmarks 12B (Habits of Mind: Computation and Estimation)