What is 1/9 plus 4/19? (Answer: 55/171)

Exact Answer

==================================================
Problem: What is 1/9 plus 4/19?
Formula / Expression: 1/9 + 4/19
Final Answer: 55/171
==================================================

Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 9 and 19 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 19 = 171.
Working: LCD(9, 19) = 171

Step 2: Convert to Equivalent Fractions with Common Denominator 171
Multiply the numerator and denominator of 1/9 by 19, and multiply the numerator and denominator of 4/19 by 9 so both fractions share the common base 171.
Working: 1 × 19/9 × 19 = 19/171 and 4 × 9/19 × 9 = 36/171

Step 3: Add the Numerators
Now add the numerators (19 + 36 = 55) and keep the common denominator 171 unchanged.
Working: 19 + 36/171 = 55/171

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 55 and 171 is 1, confirming that 55/171 cannot be reduced further—it is already in its simplest irreducible form.
Working: 55/171

Step 5: Decimal & Percentage Representation
Dividing the numerator 55 by denominator 171 produces a repeating decimal (approximately 0.321637, or 32.1637%).
Working: 55 ÷ 171 = 0.321637 (32.1637%)

Key Values:
- Simplified Fraction: 55/171
- Mixed Number Form: 55/171
- Decimal Value: 0.321637
- Percentage: 32.1637%

--------------------------------------------------
Solved with FractionsCalc:
https://fractionscalc.com/what-is-1-9-plus-4-19/
==================================================

1/9 + 4/19 = 55/171

Simplified Fraction

55/171

Mixed Number

Proper (55/171)

Decimal Value

0.321637

Percentage

32.1637%

Reduce / Convert Fraction:

Convert Fraction:

Enter Decimal Number:

Enter Percentage: %

What is % of

From Value: To Value:

Simplify Ratio: :

Switch to Proportion / Missing X Solver (A/B = C/D) →

Enter 3 known numbers and leave 1 empty (or type x) to solve:

← Switch to Ratio Simplifier (A:B)

Provide any 2 values below to calculate the remaining:

Price before discount

Discount

Price after discount

You saved

+ Add Sales Tax & Extra Coupon (Optional)

Sales Tax: % Extra Off: %

Provide any 2 values below to calculate the remaining:

Cost

Markup

REVENUE

Gross Profit

Profit Margin

Bill Subtotal

Tip Percentage

Split (People)

👥

Quick Tip:

Total Bill

Split Between

👥

Tip % (Optional)

Include Tip:

Total Price

Quantity

Unit of Measure

← Discount & Sales Tax • Ratio Simplifier (A:B) →

First Number: Second Number:

Find All Factors of:

Dividend: ÷ Divisor:

Number to Round: To Nearest:

Method: Standard (5+ ↑) Always Up (Ceil) Always Down (Floor)

Presets:

√ Square Root of: OR Power (x^y): ^{^}

x² + x + = 0

Number (n! & log):

Circle Radius (r):

Side a: Side b:

Angle (Degrees): °

Numbers (comma separated):

Total Items (n): Choose (r):

Decimal Number:

Number (1–3999):

Step-by-Step Solution: 1/9 + 4/19

Step 1

Find the Least Common Denominator (LCD)

The denominators 9 and 19 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 19 = 171.

LCD(9, 19) = 171

Step 2

Convert to Equivalent Fractions with Common Denominator 171

Multiply the numerator and denominator of 1/9 by 19, and multiply the numerator and denominator of 4/19 by 9 so both fractions share the common base 171.

1 × 19/9 × 19 = 19/171 and 4 × 9/19 × 9 = 36/171

Step 3

Add the Numerators

Now add the numerators (19 + 36 = 55) and keep the common denominator 171 unchanged.

19 + 36/171 = 55/171

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 55 and 171 is 1, confirming that 55/171 cannot be reduced further—it is already in its simplest irreducible form.

55/171

Step 5

Decimal & Percentage Representation

Dividing the numerator 55 by denominator 171 produces a repeating decimal (approximately 0.321637, or 32.1637%).

55 ÷ 171 = 0.321637 (32.1637%)

Visual Representation

The diagram below illustrates 1/9 plus 4/19 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`55/171`
Mixed Number Form	`55/171`
Decimal Form	`0.321637`
Percentage	`32.1637%`

Was this solution helpful?

Help us improve our free step-by-step tools

Frequently Asked Questions

What is 1/9 plus 4/19 as a fraction?

1/9 + 4/19 in simplest fraction form is 55/171.

What is 1/9 plus 4/19 as a decimal?

1/9 + 4/19 converted to a decimal is 0.321637.

What is 1/9 plus 4/19 as a percentage?

1/9 + 4/19 expressed as a percentage is 32.1637%.

Does 1/9 plus 4/19 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.321637...) because the denominator contains prime factors other than 2 and 5.