What is 0.84 as a fraction?

0.84 as a fraction is 21/25. Write the digits over 100 to get 84/100, then divide top and bottom by 4.

What is 0.84 as a percentage?

0.84 is 84%. Multiplying a decimal by 100 moves the point two places to the right.

How many millimetres is 0.84 of an inch?

0.84 inches is 21.336 mm, using the exact definition 1 inch = 25.4 mm.

0.84 as a fraction

Fraction21/25lowest terms

Decimal0.84

Percent84%

How to get there

0.84 has 2 digits after the point, so it is that many hundredths: write the digits over 100 — 84/100.
84 and 100 share a greatest common divisor of 4. Divide both by it: 21/25.

84 of 100 squares — 0.84 of the whole, which is also 84%.

As a measurement

Read as inches, 0.84″ is 21.336 mm exactly. The nearest marks on a rule:

Rule	Nearest mark	Inches	mm	Difference
16ths	13/16″	0.8125	20.6375	−0.6985 mm
32ths	27/32″	0.84375	21.4313	+0.0953 mm
64ths	27/32″	0.84375	21.4313	+0.0953 mm

Common questions

What is 0.84 as a fraction?: 0.84 as a fraction is 21/25. Write the digits over 100 to get 84/100, then divide top and bottom by 4.
What is 0.84 as a percentage?: 0.84 is 84%. Multiplying a decimal by 100 moves the point two places to the right.
How many millimetres is 0.84 of an inch?: 0.84 inches is 21.336 mm, using the exact definition 1 inch = 25.4 mm.

The same number, other ways

21/25Everything about the fraction: equivalents, the bar model, the number line.84%The same value as a percentage, with its own derivation.Decimal → fraction chartThe whole lookup table, printable.Nearest fractionMatch 0.84″ against any rule, with the exact error.

Where this comes from. Exact rational arithmetic on the values shown — fractions are pairs of integers until display, and inch–metric conversion uses 25.4 mm to the inch, exact by definition since 1959. See the full methodology.