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Simple Number Tools

Free calculators, visual explainers, games, and printable worksheets with answer keys - for everyday math, study, and simple finance.

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Calculators Percent, loan, fractions Worksheets Printable practice + keys Problems Sets with answers Generators Fresh questions on demand Games Math games + brain games

Featured Tools

A few standouts — interactive visualizers and simulators, plus tools people reach for most.

Calculators Trading Strategy Monte Carlo Simulator Test a trading strategy with Monte Carlo: enter a win rate and reward:risk, and see the range of outcomes over thousands of runs - profit odds, risk of ruin, drawdown, and equity curves. Calculators Probability Calculator Find the probability of a single event, combine two independent events, or repeat one event over multiple tries. Shows the chance as a percentage, fraction, decimal, and odds. Calculators Square Root, Step by Step See how to find a square root by hand, revealed step by step. Choose the regular long-division method or a fast approximation, and play the working through. Calculators Time Card Calculator Add up work hours from punch-in and punch-out times, minus lunch and breaks, for a weekly or biweekly timesheet. Total hours, per-week subtotals, and optional pay. Handles overnight shifts. Games Make 24 The classic Make 24 math game: use all four numbers once, with + - x and division, to reach 24. Every set is solvable, with a hint and your best streak saved. Calculators Cube Root Calculator Find the cube root of a number, including negatives, with perfect-cube detection and the steps.

Browse by Topic

Jump straight to a topic — each hub gathers its calculators, converters, worksheets, and practice in one place.

Percentages Percent of a number, increase, discount, tax, tips 14 tools Fractions Add, simplify, and convert to decimals or percents 11 tools Finance & Money Loans, interest, APY, ROI, margin, everyday money 16 tools Geometry Area, volume, Pythagorean, slope — with diagrams 11 tools Unit Converters Length, weight, temperature, speed, and 10 more 14 tools Dates & Time Your age, days between dates, add or subtract days 3 tools

Popular Tools

Some of the tools people reach for most — across percentages, fractions, finance, statistics, geometry, and more.

Calculators Percentage Calculator Calculate percentages, find what percent one number is of another, or work backward from a percentage. Calculators Fraction Calculator Add, subtract, multiply, and divide fractions with simplified answers. Calculators Compound Interest Calculator Estimate compound interest and final amount with different compounding frequencies. Calculators GPA Calculator Calculate your GPA on the 4.0 scale from course grades and credit hours. Add as many courses as you need. Calculators Standard Deviation Calculator Find the standard deviation, variance, and mean of a data set, for a population or a sample. Shows the steps. Calculators Slope Calculator Find the slope of a line through two points, plus the line equation. Shows rise over run and the steps. Calculators Number to Words Converter Spell out any number in words, including decimals and negatives. Useful for writing checks, forms, and legal documents. Calculators Discount Calculator Find the sale price and how much you save, add sales tax, or stack two discounts, all from the original price and percent off.

Practice, Print, Check

Worksheets and problem sets include answer keys, so students can practice and parents or teachers can check quickly.

Worksheets Multiplication Worksheets Print multiplication practice with basic facts, times tables up to 12, word problems, and a full answer key. Worksheets Fraction Worksheets Print fraction practice for simplifying fractions, equivalent fractions, addition, subtraction, and answer keys. Problems Math Word Problems With Answers Practice math word problems with answers: addition, subtraction, multiplication, division, and multi-step problems. Problems Percentage Problems With Answers Practice percentage problems with answers, including easy, medium, word, and challenge questions. Generators Percentage Problem Generator Generate printable percentage problems with an answer key for quick practice. Generators Multiplication Worksheet Generator Generate printable multiplication worksheets with answer keys. Pick a times table, the range, and how many problems.

All worksheets (28) All problems (6) All generators (10)

Made for Quick Practice

Pick a calculator, print a student worksheet, or check an answer key without digging through long explanations.

Calculate Instantly

Enter a few numbers and see the result right away, with short steps that explain what happened.

Print Student Sheets

Use practice pages for classwork, tutoring, homework review, or extra practice at home.

Check Answers Separately

Answer keys print apart from the student worksheet so practice stays clean and easy to review.