Decimal number

4.5

Positive
Decimal
1 d.p.
Exact fraction

4.5 is a decimal number equal to 9⁄2. It lies between 4 and 5, and as a percentage it is 450%.

Number properties

Absolute value4.5

SignPositive

Integer part4

Fractional part0.5

Decimal places1

Floor4

Ceiling5

Rounded to nearest5

Truncated4

Fractions & ratios

As a fraction9/2exact

Ratio9 : 2

As a percentage450%

Reciprocal0.2222222222≈

Arithmetic

Double9

Half2.25

Square20.25

Cube91.125

Square root2.1213203436≈

Cube root1.6509636244≈

Negation-4.5

Natural logarithm1.5040773968≈

Logarithm base 100.6532125138≈

Representations

Decimal4.5

Scientific notation4.5 × 10^0

Exponential4.5e+0

IEEE 754 binary64 (hex)0x4012000000000000the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0x4090000032-bit single precision, may lose accuracy

Stored as4.5the nearest binary64 value to what you typed

Rounding

To 0 decimal places5

To 1 decimal place4.5

To 2 decimal places4.50

To 3 decimal places4.500

To 4 decimal places4.5000

To 1 significant figure5

To 2 significant figures4.5

To 3 significant figures4.5

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