Recognised as Decimal number

-0.99999091

Negative
Decimal
8 d.p.
8 s.f.

-0.999991 is a decimal number equal to approximately -110,010⁄110,011. It lies between -1 and 0, and as a percentage it is -99.999091%.

Number properties

Absolute value0.999991

SignNegative

Integer part0

Fractional part0.99999091

Decimal places8

Floor-1

Ceiling0

Rounded to nearest-1

Truncated0

Fractions & ratios

As a fraction-110,010/110,011≈≈ -0.99999091

Ratio-110,010 : 110,011

As a percentage-99.999091%

Reciprocal-1.0000090901≈

Arithmetic

Double-1.999982

Half-0.499995

Square0.999982

Cube-0.999973

Cube root-0.99999697≈

Negation0.999991

Representations

Decimal-0.99999091

Scientific notation-9.9999091 × 10^-1

Exponential-9.9999091e-1

IEEE 754 binary64 (hex)0xBFEFFFECEFD7E9B6the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0xBF7FFF6732-bit single precision, may lose accuracy

Stored as-0.99999091the nearest binary64 value to what you typed

Rounding & precision

Significant figures as written8counted from the digits as typed, not from the value

To 0 decimal places-1

To 1 decimal place-1.0

To 2 decimal places-1.00

To 3 decimal places-1.000

To 4 decimal places-1.0000

To 1 significant figure-1

To 2 significant figures-1.0

To 3 significant figures-1.00

To 4 significant figures-1.000

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