0.9 as a fraction
0.9 is 9 tenths, so write it as 9/10.
The answer
0.9 = 9/10
How to write 0.9 as a fraction
Put the digits in a place value chart. The last digit tells you the bottom of the fraction.
| Ones | Tenths |
|---|---|
| 0 | 9 |
The last digit is in the tenths column, so 0.9 is 9 tenths: 9/10.
9 and 10 share no factor except 1, so 9/10 is already in its simplest form.
As a percentage, 0.9 = 90%: multiply by 100, which moves each digit two places to the left.
To check, divide back: see 9/10 as a decimal and 9/10 as a percentage.
See 9/10
Shade 9/10 on a fraction wall
The wall opens with 9/10 shaded in the tenths row. Look straight down: no other row ends in exactly the same place, so no other fraction on this wall equals 9/10. Tap other pieces to try more fractions.
A fraction wall from halves to tenths, opening on 9/10.
More decimals as fractions
Questions parents ask
What is 0.9 as a fraction in its simplest form?
0.9 = 9/10. 9 and 10 share no factor except 1, so 9/10 is already in its simplest form.
How do you write 0.9 as a fraction?
The last digit of 0.9 is in the tenths column, so write the digits over 10: 9/10. Then simplify if you can.
What is 0.9 as a percentage?
0.9 = 90%. Multiply by 100: the digits move two places to the left.
Fractions, decimals and percentages run all through 11+ maths
Converting between them turns up in 11+ questions on percentages, ratio, money and data. The free diagnostic checks maths, English and both kinds of reasoning, and shows what to practise next. No card is required.