Recognised as Decimal number

30.5

Positive
Decimal
1 d.p.
Exact fraction
3 s.f.

30.5 is a decimal number equal to 61⁄2. It lies between 30 and 31, and as a percentage it is 3,050%.

Number properties

Absolute value30.5

SignPositive

Integer part30

Fractional part0.5

Decimal places1

Floor30

Ceiling31

Rounded to nearest31

Truncated30

Fractions & ratios

As a fraction61/2exact

Ratio61 : 2

As a percentage3,050%

Reciprocal0.0327868852≈

Arithmetic

Double61

Half15.25

Square930.25

Cube28,372.625

Square root5.5226805086≈

Cube root3.1243998848≈

Negation-30.5

Natural logarithm3.4177266836≈

Logarithm base 101.4842998393≈

Representations

Decimal30.5

Scientific notation3.05 × 10^1

Exponential3.05e+1

IEEE 754 binary64 (hex)0x403E800000000000the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0x41F4000032-bit single precision, may lose accuracy

Stored as30.5the nearest binary64 value to what you typed

Rounding & precision

Significant figures as written3counted from the digits as typed, not from the value

To 0 decimal places31

To 1 decimal place30.5

To 2 decimal places30.50

To 3 decimal places30.500

To 4 decimal places30.5000

To 1 significant figure3e+1

To 2 significant figures31

To 3 significant figures30.5

To 4 significant figures30.50

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