Numbers & Arithmetic
The most-searched math tools for students and professionals
GCF & LCM Calculator Popular
Greatest common factor & least common multiple
Fraction Calculator Popular
Simplify, add, subtract, multiply & divide fractions
Percentage Calculator Popular
Percent of, percent change, find original value
Roman Numeral Converter Popular
Numbers ↔ Roman numerals with full breakdown
Prime Factorization
Prime factors of any number with factor tree
Scientific Notation
Convert to/from scientific notation (standard form)
Long Division Calculator
Step-by-step long division with remainders
Significant Figures
Round to any number of significant figures
Algebra & Geometry
Equations, shapes, and problem-solving tools
Common Questions
How do I find the GCF of two numbers?
Enter both numbers in our GCF calculator. It shows the prime factorization of each number and identifies the greatest common factor. Example: GCF(48, 18) = 6.
How do I simplify a fraction?
Divide both numerator and denominator by their GCF. Our fraction calculator does this automatically and shows every step of the simplification.
What is MMXXIV in numbers?
MMXXIV = 2024. MM = 2000, XX = 20, IV = 4. Use our Roman numeral converter to convert any number instantly.
What is 15% of 200?
15% of 200 = 30. The formula is (15 ÷ 100) × 200 = 30. Use our percentage calculator for any percentage problem.