Sumwise

What is 42/10 as a Decimal?

42/10 = 4.2

Decimal
4.2
Percentage
420%
Simplified
21/5
Type
improper fraction

Sumwise · Maintained by Theo Abbott (pen name) · automated checks · Data: exact arithmetic; unit definitions from NIST SP 811 · Updated · How the checks work

How to work it out

  1. Simplify: 42/10 = 21/5 (divide by 2)
  2. Divide the numerator by the denominator: 42 ÷ 10 = 4.2
  3. Check: Work backwards: 4.2 × 10 = 42, which is 42 once rounding is allowed for.

In a spreadsheet: =42/10. Dividing the denominator by the numerator flips the fraction. A bar over (or brackets around) digits means they repeat forever.

What the result means

As a percentage, 42/10 is 420%. It is an improper fraction: as a mixed number it is 4 1/5.

Cooking: a recipe that asks for 42/10 of a cup needs 4.2 cups, about 1,008 millilitres.

Comparing with nearby fractions

42/10 (4.2) is bigger than 42/11 (3.8182) and smaller than 43/10 (4.3). A bigger denominator means smaller pieces, so with the same numerator the fraction gets smaller.

Related results

Results for nearby numbers
1/10 as a decimal

1/10 = 0.1

2/10 as a decimal

2/10 = 0.2

3/10 as a decimal

3/10 = 0.3

43/10 as a decimal

43/10 = 4.3

41/10 as a decimal

41/10 = 4.1

The other way round: 10/42 as a decimal. Flipping the fraction gives its reciprocal, 10/42 = 0.(238095); the two decimals multiply to exactly 1.

Practice

8/66 as a decimal
Show answer

8/66 = 0.(12)

9/71 as a decimal
Show answer

9/71 = 0.(12676056338028169014084507042253521)

77/60 as a decimal
Show answer

77/60 = 1.28(3)

45/28 as a decimal
Show answer

45/28 = 1.60(714285)

45/19 as a decimal
Show answer

45/19 = 2.(368421052631578947)

46/62 as a decimal
Show answer

46/62 = 0.(741935483870967)

Calculate another

How answers are calculated and checked: methodology.

Questions

What is 42/10 as a Decimal?

42/10 as a decimal is 4.2. Long-division steps and simplified fraction.

What is 42/10 as a percentage?

420%. Multiply the decimal 4.2 by 100.

What is 42/10 in simplest form?

21/5. Divide the top and bottom by their greatest common factor, 2.