Build one skill at a time
Start with one of our 18 live calculators. More ACELZO tools are on the way.
Fractions
Operations, LCD, simplification and mixed numbers.
Simplify Fractions
Reduce any fraction to lowest terms, with optional steps.
Fraction to Decimal
Convert a fraction to a decimal, with repeating digits clearly marked.
Factors & GCF
Find factors and greatest common factors.
Prime Factorization
Break a whole number into prime factors.
Multiples & LCM
Find least common multiples and learn why.
Multiplication
Get the product fast, then learn the algorithm and mental-math strategies.
Division
Find the quotient and remainder, with optional step-by-step strategies.
Decimals
Calculate decimal operations with optional place-value teaching.
Decimal to Fraction
Turn a terminating decimal into a simplified fraction.
Percent to Fraction
Write a percent as a fraction.
Mixed Number Calculator
Add, subtract, multiply, and divide mixed numbers.
Adding Fractions
Add and simplify fractions, with optional teaching.
Fraction to Percent
Convert a fraction to a percentage.
Percentage Calculator
Find a percent, compare amounts, or calculate percent change.
Unit Converter
Convert length, temperature, weight, and volume with an instant answer.
Mortgage Calculator
Estimate monthly mortgage payments with optional costs and an explanation of the math.
Compound Interest Calculator
Estimate future savings growth with optional regular contributions.
Mental Math
Coming soon • Fast strategies that build number sense.
Learn → Practice → Master
Every ACELZO tool follows the same learning path.
Learn
See the method and understand why it works.
Practice
Try examples and build confidence.
Master
Use the strategy independently and check your work.
Answers are useful. Understanding is powerful.
Use the calculator to check your work, then study the steps until you can explain the method yourself.
Let’s level up!