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What is 4.5 as a Fraction?

Learn how to convert 4.5 to a fraction with step-by-step instructions

Quick Answer

4.5 as a fraction is:

9/2

This is the simplest form of the fraction

4.5 Decimal to Fraction Calculator

Convert Any Decimal to a Fraction

Enter a decimal number to see its fraction equivalent

How to Convert 4.5 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 4.5 to a Fraction

Let's apply the method to convert 4.5

1

Count the decimal places in 4.5

4.5
There is 1 digit after the decimal point
2

Multiply by 10 (10)

4.5 × 10 = 45
Moving the decimal point 1 place right
3

Write as a fraction

45/10
Numerator: 45, Denominator: 10
4

Simplify the fraction

45/10 = 9/2
Divide both numbers by their greatest common factor (5)

Final Result

4.5 = 9/2

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 4.5 often result in fractions with large denominators

Related Decimal to Fraction Conversions

DecimalFractionComparison
0.450.9/2Smaller
4.59/2Current Value
4590/2Larger
450900/2Larger
45009000/2Larger

Additional Information

Scientific Notation

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

Percentage

4.5 is equal to 450.000% as a percentage

Common Calculations with 4.5

Quick Reference Guide

Common calculations and conversions with 4.5

Multiplication

  • 4.5 × 10 = 45
  • 4.5 × 100 = 450
  • 4.5 × 1000 = 4500
  • 4.5 × 10000 = 45000
  • 4.5 × 2 = 9

Division

  • 4.5 ÷ 2 = 2.25
  • 4.5 ÷ 5 = 0.9
  • 4.5 ÷ 10 = 0.45
  • 4.5 ÷ 1/4.5 = 2

4.5 in Different Number Systems

Decimal

4.5

Scientific Notation

9 × 10⁻1

Percentage

450.000%

Fraction

9/2

Parts Per Million

4500000 PPM

Binary

0.0101

Real-World Applications of 4.5

Where You Might Encounter 4.5

Scientific Applications

  • • Microscopic measurements (4500000 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