Decimal number

20.5

Positive
Decimal
1 d.p.
Exact fraction

20.5 is a decimal number equal to 41⁄2. It lies between 20 and 21, and as a percentage it is 2,050%.

Number properties

Absolute value20.5

SignPositive

Integer part20

Fractional part0.5

Decimal places1

Floor20

Ceiling21

Rounded to nearest21

Truncated20

Fractions & ratios

As a fraction41/2exact

Ratio41 : 2

As a percentage2,050%

Reciprocal0.0487804878≈

Arithmetic

Double41

Half10.25

Square420.25

Cube8,615.125

Square root4.5276925691≈

Cube root2.7368518374≈

Negation-20.5

Natural logarithm3.0204248861≈

Logarithm base 101.3117538611≈

Representations

Decimal20.5

Scientific notation2.05 × 10^1

Exponential2.05e+1

IEEE 754 binary64 (hex)0x4034800000000000the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0x41A4000032-bit single precision, may lose accuracy

Stored as20.5the nearest binary64 value to what you typed

Rounding

To 0 decimal places21

To 1 decimal place20.5

To 2 decimal places20.50

To 3 decimal places20.500

To 4 decimal places20.5000

To 1 significant figure20

To 2 significant figures21

To 3 significant figures20.5

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