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What is 1.8 as a Fraction?

Learn how to convert 1.8 to a fraction with step-by-step instructions

Quick Answer

1.8 as a fraction is:

9/5

This is the simplest form of the fraction

1.8 Decimal to Fraction Calculator

Convert Any Decimal to a Fraction

Enter a decimal number to see its fraction equivalent

How to Convert 1.8 to a Fraction

General Method: Converting Decimals to Fractions

Follow these steps to convert any decimal to a fraction

Step 1: Count Decimal Places

Count the number of digits after the decimal point

Example: 0.25 has 2 decimal places

Step 2: Multiply by Power of 10

Multiply by 10 raised to the number of decimal places

0.25 × 100 = 25

Step 3: Create Fraction

Use the result as numerator over the multiplier as denominator

25/100

Step 4: Simplify

Reduce the fraction if possible by dividing both numbers by their GCD

25/100 = 1/4

Converting 1.8 to a Fraction

Let's apply the method to convert 1.8

1

Count the decimal places in 1.8

1.8
There is 1 digit after the decimal point
2

Multiply by 10 (10)

1.8 × 10 = 18
Moving the decimal point 1 place right
3

Write as a fraction

18/10
Numerator: 18, Denominator: 10
4

Simplify the fraction

18/10 = 9/5
Divide both numbers by their greatest common factor (2)

Final Result

1.8 = 9/5

Tips and Notes

  • The denominator will always be a power of 10 for terminating decimals
  • Each decimal place corresponds to multiplying by 10 (e.g., 1 places = 10)
  • Very small decimals like 1.8 often result in fractions with large denominators

Related Decimal to Fraction Conversions

DecimalFractionComparison
0.180.9/5Smaller
1.89/5Current Value
1890/5Larger
180900/5Larger
18009000/5Larger

Additional Information

Scientific Notation

1.8 can be written as 9 × 10⁻1 in scientific notation

Percentage

1.8 is equal to 180.000% as a percentage

Common Calculations with 1.8

Quick Reference Guide

Common calculations and conversions with 1.8

Multiplication

  • 1.8 × 10 = 18
  • 1.8 × 100 = 180
  • 1.8 × 1000 = 1800
  • 1.8 × 10000 = 18000
  • 1.8 × 5 = 9

Division

  • 1.8 ÷ 2 = 0.9
  • 1.8 ÷ 5 = 0.36
  • 1.8 ÷ 10 = 0.18
  • 1.8 ÷ 1/1.8 = 5

1.8 in Different Number Systems

Decimal

1.8

Scientific Notation

9 × 10⁻1

Percentage

180.000%

Fraction

9/5

Parts Per Million

1800000 PPM

Binary

0.1000

Real-World Applications of 1.8

Where You Might Encounter 1.8

Scientific Applications

  • • Microscopic measurements (1800000 micrometers)
  • • Chemical concentrations
  • • Statistical probability calculations
  • • Error margins in precise measurements

Engineering

  • • Manufacturing tolerances
  • • Electronic component specifications
  • • Quality control measurements
  • • Precision engineering

Related Decimal Conversions