A fraction calculator that shows its work. You can add, subtract, multiply and divide fractions or mixed numbers, including negatives. Every answer is reduced to lowest terms using exact integer math, so there are no rounding errors. You also get step-by-step solutions, equivalent fractions, and decimal and percent conversions. Extra tools let you convert decimals or percents to fractions and switch between improper and mixed forms. It also has history, copy, dark mode and keyboard shortcuts.