Recognised as Decimal number

-640.5

Negative
Decimal
1 d.p.
Exact fraction
4 s.f.

-640.5 is a decimal number equal to -1,281⁄2. It lies between -641 and -640, and as a percentage it is -64,050%.

Number properties

Absolute value640.5

SignNegative

Integer part-640

Fractional part0.5

Decimal places1

Floor-641

Ceiling-640

Rounded to nearest-640

Truncated-640

Fractions & ratios

As a fraction-1,281/2exact

Ratio-1,281 : 2

As a percentage-64,050%

Reciprocal-0.0015612802≈

Arithmetic

Double-1,281

Half-320.25

Square410,240.25

Cube-262,758,880.125

Cube root-8.6199823788≈

Negation640.5

Representations

Decimal-640.5

Scientific notation-6.405 × 10^2

Exponential-6.405e+2

IEEE 754 binary64 (hex)0xC084040000000000the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0xC420200032-bit single precision, may lose accuracy

Stored as-640.5the 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 places-641

To 1 decimal place-640.5

To 2 decimal places-640.50

To 3 decimal places-640.500

To 4 decimal places-640.5000

To 1 significant figure-6e+2

To 2 significant figures-6.4e+2

To 3 significant figures-641

To 4 significant figures-640.5

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