Category
Arithmetic & Numbers calculators
Arithmetic is where most maths confidence is won or lost. A fraction that will not simplify or a percentage that comes out “wrong” usually comes down to one skipped idea — a common denominator, a base value, a missed factor.
Every calculator in this group shows the working as numbered steps, not just a result. Use them to check homework, to see where your own method diverged, or to learn the routine before a test.
All arithmetic & numbers tools
Fraction Calculator
Add, subtract, multiply and divide with simplified steps.
Simplify Fractions Calculator
Reduce any fraction to lowest terms with the GCF shown.
Percentage Calculator
% of a number, what percent, original value and % change.
LCM & GCF Calculator
LCM and GCF of any numbers, by prime factorization.
Prime Factorization Calculator
Factor any number, test for primes and count divisors.
Percentage Change Calculator
Percent increase or decrease between two values.
Times Tables Generator
Any multiplication table, up to 30 lines.
Factorial Calculator
Exact n! up to 1000, with trailing zeros.
Ratio Calculator
Simplify ratios and solve proportions.
Rounding Calculator
Decimal places, significant figures, nearest multiple.
Divisibility Rules Calculator
Test any number against the rules for 2–10.
Factors Calculator
All factors, factor pairs and number type.
Place Value Calculator
Place values and expanded form for any number.
What you can do here
- Add, subtract, multiply or divide fractions and mixed numbers
- Reduce a fraction to lowest terms
- Work out a percentage, a percent change or an original value
- Find the LCM and GCF of two or more numbers
- Break a number into prime factors
Learn the method first
Guides in this category teach the idea, then hand you to the matching calculator to practise.
- How to Add Fractions (Same and Different Denominators)
- How to Calculate Percentages: 4 Problem Types, Solved
- How to Simplify Fractions to Lowest Terms
- How to Find the LCM and GCF (HCF) With Prime Factors
- Prime Numbers Explained: Test, Factor and Count Divisors
- Divisibility Rules for 2 to 10, Explained
Questions about this category
Which calculator should I start with?
Start with the one that matches the wording of your question. “What is 15% of 240?” belongs to the percentage calculator; “1/2 + 1/3” belongs to the fraction calculator. Each page links to the closest neighbours if you picked the wrong one.
Do these calculators show rounding?
Yes. Where an answer is not exact, the working says how many decimal places are shown, and fractions are always kept exact until the final decimal line.