Recognised as Decimal number

0.9999

Positive
Decimal
4 d.p.
Exact fraction
4 s.f.

0.9999 is a decimal number equal to 9,999⁄10,000. It lies between 0 and 1, and as a percentage it is 99.99%.

Number properties

Absolute value0.9999

SignPositive

Integer part0

Fractional part0.9999

Decimal places4

Floor0

Ceiling1

Rounded to nearest1

Truncated0

Fractions & ratios

As a fraction9,999/10,000exact

Ratio9,999 : 10,000

As a percentage99.99%

Reciprocal1.00010001≈

Arithmetic

Double1.9998

Half0.49995

Square0.9998

Cube0.9997

Square root0.9999499987≈

Cube root0.9999666656≈

Negation-0.9999

Natural logarithm-0.000100005≈

Logarithm base 10-0.0000434316≈

Representations

Decimal0.9999

Scientific notation9.999 × 10^-1

Exponential9.999e-1

IEEE 754 binary64 (hex)0x3FEFFF2E48E8A71Ethe exact 64-bit pattern stored

IEEE 754 binary32 (hex)0x3F7FF97232-bit single precision, may lose accuracy

Stored as0.9999the nearest binary64 value to what you typed

Rounding & precision

Significant figures as written4counted from the digits as typed, not from the value

To 0 decimal places1

To 1 decimal place1.0

To 2 decimal places1.00

To 3 decimal places1.000

To 4 decimal places0.9999

To 1 significant figure1

To 2 significant figures1.0

To 3 significant figures1.00

To 4 significant figures0.9999

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