The Math tab grew fast over the last few batches: homework-grade statistics, geometry and trig helpers, modular arithmetic, and finance calculators—all browser-local. You do not need to scan hundreds of cards; start from the task below and open the page that matches your paste.
Statistics and hypothesis checks
When you have counts or small tables from a lab report or A/B test, paste them into a lite calculator instead of rebuilding formulas in a spreadsheet.
- Sample mean and Spearman rank correlation — descriptive stats on pasted number lists.
- Wilson score interval — confidence bounds for a proportion without normal approximations.
- Chi-square goodness of fit and Yates-corrected chi-square — compare observed counts to expected buckets.
- GPA calculator — weighted grade-point math from course rows.
Geometry, trig, and number theory
- Square area, torus volume, and golden ratio split — quick shape and proportion math.
- Degrees ↔ radians, trig (degrees), and hyperbolic sine — angle and function homework beside the main unit converters.
- Modular inverse, modular exponentiation, divisors list, and even/odd checker — integer properties without leaving the tab.
- Logarithm calculator, weighted average, and 2×2 determinant — small linear algebra and log base switches.
Finance and everyday units
- Compound interest, loan payment, and tip calculator — back-of-envelope money math.
- Browse the units hub for length, temperature, data size, CSS px/rem, and dozens of one-off converters (feet→meters, kPa→pascal, and similar) added in recent batches.
For a wider task map across geometry, readability indices, and date math from earlier batches, see calculators, readability, and dates.