Benchmarks 9D (The Mathematical World: Uncertainty)
Grades 3-5, page 227
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.
Benchmarks 12B (Habits of Mind: Computation and Estimation)
Grades K-2, page 290
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)
Grades K-2, page 290
Judge whether measurements and computations of quantities such as length,
area, volume, weight, or time are reasonable in a familiar context by comparing
them to typical values.