How to Do Fractions on a Calculator

Fraction Calculator & Solver

+ − × ÷

Result:

function calculateFraction() { var n1 = parseInt(document.getElementById('num1').value); var d1 = parseInt(document.getElementById('den1').value); var n2 = parseInt(document.getElementById('num2').value); var d2 = parseInt(document.getElementById('den2').value); var op = document.getElementById('operator').value; if (isNaN(n1) || isNaN(d1) || isNaN(n2) || isNaN(d2)) { alert("Please fill in all numerator and denominator fields."); return; } if (d1 === 0 || d2 === 0) { alert("Denominator cannot be zero."); return; } var resNum, resDen; if (op === 'add') { resNum = (n1 * d2) + (n2 * d1); resDen = d1 * d2; } else if (op === 'subtract') { resNum = (n1 * d2) – (n2 * d1); resDen = d1 * d2; } else if (op === 'multiply') { resNum = n1 * n2; resDen = d1 * d2; } else if (op === 'divide') { resNum = n1 * d2; resDen = d1 * n2; } if (resDen === 0) { alert("Division by zero error."); return; } // Simplify logic function getGCD(a, b) { return b ? getGCD(b, a % b) : Math.abs(a); } var common = getGCD(resNum, resDen); var finalNum = resNum / common; var finalDen = resDen / common; // Handle negative signs if (finalDen < 0) { finalNum = -finalNum; finalDen = -finalDen; } // Display results document.getElementById('fractionResult').style.display = 'block'; document.getElementById('res-num').innerText = finalNum; document.getElementById('res-den').innerText = finalDen; var decimal = finalNum / finalDen; document.getElementById('res-decimal').innerText = "(Decimal: " + decimal.toFixed(4) + ")"; // If it's a whole number, hide denominator if (finalDen === 1) { document.getElementById('res-den').style.display = 'none'; document.querySelector('#res-frac div').style.display = 'none'; } else { document.getElementById('res-den').style.display = 'block'; document.querySelector('#res-frac div').style.display = 'block'; } }

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How to Do Fractions on a Calculator

Understanding how to input and solve fractions on a calculator depends on the type of device you are using. While basic 4-function calculators require converting fractions to decimals, scientific and graphing calculators often have dedicated fraction buttons.

Method 1: Using the Decimal Conversion (Standard Calculator)

On a standard calculator, you treat the fraction bar as a division sign. To input 3/4, you would follow these steps:

1. Type the numerator (top number).
2. Press the division button (÷).
3. Type the denominator (bottom number).
4. Press equals (=).

Example: 3 ÷ 4 = 0.75. To add fractions, convert both to decimals first, add them, and then convert the result back to a fraction if necessary.

Method 2: Using the Fraction Button (Scientific Calculator)

Most scientific calculators (like TI or Casio models) have a specific key for fractions, usually labeled a b/c or a template button with □/□.

• Step 1: Press the fraction button.
• Step 2: Enter the numerator.
• Step 3: Use the arrow keys (or press the fraction button again) to move to the denominator.
• Step 4: Enter the denominator and press "Enter" or "=".

Fraction Operations: Manual Cheat Sheet

Operation	Formula	Example (1/2 & 1/3)
Addition	(ad + bc) / bd	5/6
Subtraction	(ad – bc) / bd	1/6
Multiplication	(ac) / (bd)	1/6
Division	(ad) / (bc)	3/2 (or 1.5)

Realistic Examples

Adding Mixed Ingredients: If a recipe calls for 1/2 cup of flour and you want to add another 3/4 cup, you would input 1/2 + 3/4. On our calculator above, entering 1, 2, 3, and 4 with the "add" operator yields 5/4, which is 1.25 cups.

Splitting Costs: If you need to divide 1/3 of a shared $90 bill among 2 people, you would calculate (1/3) ÷ 2. The result is 1/6 of the total bill per person.