What is 3 and 9/7 as a Decimal?

Fraction to Decimal Converter

What is 3 9/7 as a decimal?

Answer

Fraction 3 9/7 as a decimal is

4.285714

≈ 4.29 to hundredths

Repeating decimal: denominator 7 has the factor 7, not 2 or 5 · the bar marks the period 285714 — 6 digits repeat forever

9 = 1 × 7 + 2: whole part 3 + 1 = 4, then divide the remainder 2

remainder	×10	= digit × 7 + new remainder	digit
2	20	2 × 7 + 6	2
6	60	8 × 7 + 4	8
4	40	5 × 7 + 5	5
5	50	7 × 7 + 1	7
1	10	1 × 7 + 3	1
3	30	4 × 7 + 2	4

Remainder 2 is back after the 6th division → the 6 digits 285714 repeat: 0.285714.

4 + 0.285714 = 4.285714

Fraction 3 9/7 as a decimal is 4.(285714)

To convert 3 9/7 to a decimal, divide the numerator by the denominator, 9 ÷ 7 = 1.(285714), then add the whole part: 3 + 1.(285714) = 4.(285714).

In lowest terms its denominator 7 has the prime factor 7, so the division never ends: a remainder comes back and the same digits repeat forever.

Multiply by 100: 3 9/7 ≈ 428.57%.