An 1:10 voltage divider for your ADC consists of two resistors, one having a R value and the other a 9R value.
The problem is that no pair of the common E12 E24 standardized resistor value pairs can provide the perfect ratio 1:9.

Resistors are usually cheap, so the first idea is to puchase exactly 10 resistors. This has the following advantage: the resistors purchased on a reel are usually from the same batch, so their value match better together.

between 0V and the ADC you have 3 resistors in // so the corresponding value is R/3
between the ADC have 3 resitors in serie so the corresponding value is 3R.

RIN67630:
The problem is that no pair of the common E12 E24 standardized resistor value pairs can provide the perfect ratio / (R/3) = 9 the perfect ratio required!

Three resistors can. Two 18k in parallel, and one 1k to ground.

But why the "perfect ratio".
An Arduino hasn't got a "perfect Aref", so you always need to calibrate anyway.
Leo..