Apply grade concepts and procedures to real-world contexts Make reasoned estimates and record calculations with an appropriate level of precision. Let's make some estimates. Required Materials: internet-enabled device tools for creating a visual display four-function calculators. Tools for creating a visual display are only needed if you would like students to present their work in an organized way and have the option of conducting a gallery walk. A Fermi problem requires students to make a rough estimate for quantities that are difficult or impossible to measure directly.