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Fraction Calculator for Practice and Tests

Check your fraction results: addition, subtraction, multiplication, division, simplification and decimal conversion. Ideal for grades 4-9 and high school — use the tool to verify your calculations, then ask your question on Math AI for a step-by-step explanation.

Basic Operations

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Example: 1/2 + 1/4 = 3/4

Simplification

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Example: 21/98 = 3/14

Decimal to Fraction

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Example: 1.375 = 11/8

Fraction to Decimal

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Large Fraction Calculator

Use this calculator if the numerators or denominators are very large integers.

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Complete Fraction Guide

This calculator offers addition, subtraction, multiplication, division, simplification, mixed numbers and decimal conversion. Use it to quickly verify your results.

Basic Rules

  • Addition/Subtraction: same denominator, then add/subtract numerators.
  • Different denominators: find LCM for a common denominator.
  • Multiplication: numerator times numerator, denominator times denominator.
  • Division: multiply by the reciprocal of the second fraction.
  • Simplify: divide by GCD.

Useful Conversions

  • Fraction → Decimal: numerator ÷ denominator.
  • Decimal → Fraction: write as power of ten, then simplify.
  • Mixed number: 2 3/4 = (2 × 4 + 3) / 4 = 11/4.

Examples

8/3 + 2/3 = 10/3.

7/3 + 2/5 → LCM 15 → 35/15 + 6/15 = 41/15.

12/18 = 2/3 (GCD 6).

3/4 = 0.75.

2 1/2 = 5/2.

Common Errors

  • Adding denominators instead of finding common denominator.
  • Not simplifying the final result.
  • Confusing numerator and denominator in conversions.

Applications

  • Recipes (1/2, 3/4, etc.).
  • Measurements in geometry (parts of a length or area).
  • Proportionality and sharing.

FAQ

  • Wrong result? Check common denominator and simplification.
  • Mixed numbers? Use format "2 3/4".
  • Need an explanation? The Math AI assistant can explain each step.