Recognised as Decimal number

31.5

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

31.5 is a decimal number equal to 63⁄2. It lies between 31 and 32, and as a percentage it is 3,150%.

Number properties

Absolute value31.5

SignPositive

Integer part31

Fractional part0.5

Decimal places1

Floor31

Ceiling32

Rounded to nearest32

Truncated31

Fractions & ratios

As a fraction63/2exact

Ratio63 : 2

As a percentage3,150%

Reciprocal0.0317460317≈

Arithmetic

Double63

Half15.75

Square992.25

Cube31,255.875

Square root5.6124860802≈

Cube root3.1581797988≈

Negation-31.5

Natural logarithm3.4499875458≈

Logarithm base 101.4983105538≈

Representations

Decimal31.5

Scientific notation3.15 × 10^1

Exponential3.15e+1

IEEE 754 binary64 (hex)0x403F800000000000the exact 64-bit pattern stored

IEEE 754 binary32 (hex)0x41FC000032-bit single precision, may lose accuracy

Stored as31.5the 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 places32

To 1 decimal place31.5

To 2 decimal places31.50

To 3 decimal places31.500

To 4 decimal places31.5000

To 1 significant figure3e+1

To 2 significant figures32

To 3 significant figures31.5

To 4 significant figures31.50

Keep nerding

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