Model a real problem with numbers, check units, and sanity-check answers.
STEM work runs on quantitative reasoning — using numbers to describe and solve real problems. Three habits matter most:
- Units. A number without a unit is meaningless. "5" is nothing; "5 meters" is something. Always track units, and check that they match on both sides of an equation.
- Estimation. Before you calculate exactly, guess the rough size of the answer. If you expect "about 100" and your calculator says 0.01, you made a mistake somewhere.
- Ratios and percentages. Most real comparisons — speeds, prices, growth, doses — are ratios. Get comfortable moving between fractions, decimals, and percentages.
The goal isn't to memorize formulas. It's to take a messy real-world situation and turn it into numbers you can reason about.