Calculadora de Frações com Simplificação e Etapas
Some, subtraia, multiplique e divida frações online com cálculo do MMC (mínimo múltiplo comum), simplificação e números mistos.
Explicação Matemática
Ein Bruch stellt einen Teil eines Ganzen oder das Verhältnis zweier ganzer Zahlen dar. Er besteht aus dem Zähler (oben) und dem Nenner (unten).
Die 4 Grundrechenarten bei Brüchen:
- Addition & Subtraktion: Ungleichnamige Brüche müssen zuerst auf einen gemeinsamen Hauptnenner (das kleinste gemeinsame Vielfache kgV) erweitert werden. Anschließend werden die Zähler addiert bzw. subtrahiert.
- Multiplikation: Zähler wird mit Zähler und Nenner mit Nenner multipliziert:
(a/b) × (c/d) = (a×c)/(b×d). - Division: Man multipliziert mit dem Kehrwert des Divisors:
(a/b) ÷ (c/d) = (a/b) × (d/c) = (a×d)/(b×c).
Klammern & Rangfolge der Rechenarten (Punkt vor Strich):
Enthält ein Bruchterm mehrere Operationen oder Klammern wie (1/2 + 2/3) × (3/4 - 1/6), gelten die mathematischen Prioritätsregeln:
- Klammern zuerst: Ausdrücke in Klammern werden zuerst berechnet und zu einem Bruch zusammengefasst.
- Punkt vor Strich: Multiplikation (×) und Division (÷) binden stärker als Addition (+) und Subtraktion (-).
- Gleichrangige Operationen von links nach rechts: Mehrere Additionen/Subtraktionen oder Multiplikationen/Divisionen werden der Reihe nach von links nach rechts abgearbeitet.
Origem Histórica e o Desafio Resolvido
Por que esta matemática foi desenvolvida, de onde veio e que problema real resolveu?
1. Fair Distribution of Bread & Grain Rations
How do you divide 7 loaves of bread equally among 10 pyramid construction workers without anyone feeling cheated? Whole integers were insufficient for complex rationing and storehouse administration.
2. Unit Fractions & Common Denominators
Scribe Ahmes documented rational arithmetic in the Rhind Papyrus (1650 BCE), decomposing fractions into unit fractions (e.g. 7/10 = 1/2 + 1/5). Later mathematicians developed lowest common denominators to add and multiply arbitrary fractions.
3. Music Theory, Clock Ratios & Computer Science
Musical tuning systems (frequency ratios 3/2, 4/3), mechanical gears, and exact rational arithmetic in computer algebra systems rely on fraction theory.
Aplicações no Mundo Real e Casos Práticos
Por que aprendemos isso? Veja como essa matemática é aplicada na economia, engenharia, ciência e no dia a dia:
Material Cutting Without Waste
Woodworkers and machinists divide panels and beams into precise fractional parts to ensure perfect joint fits and minimize offcut scrap.
Dividing a 2 1/2 meter board into 4 equal segments equals (5/2) / 4 = 5/8 meter = 62.5 cm per piece.
Note Values & Time Signatures
Musicians and composers structure songs using note fractions (whole, half, quarter, eighth, sixteenth) and meter signatures like 3/4 or 6/8.
A 4/4 measure can be composed of one half note (1/2) and two quarter notes (2 * 1/4): 1/2 + 2/4 = 1.
Mixing Ratios & Serial Dilutions
Laboratories prepare chemical solutions with exact compound ratios by utilizing fractions for solute and solvent concentrations.
A 1:4 dilution ratio (1/5 concentrate and 4/5 water) requires exactly 1 liter of concentrate for a 5-liter total mixture.
Perguntas Frequentes (FAQ)
Como somar frações com denominadores diferentes?
Calcula-se o MMC dos denominadores para encontrar o denominador comum, ajustam-se os numeradores e somam-se apenas os numeradores.
Como dividir duas frações?
Multiplica-se a primeira fração pelo inverso (inverter numerador e denominador) da segunda fração.