Question

4.9 how do you write it In a improper fraction?

Answer 1

49/10 This is the improper way

Answer 2

4.9 is also 4 and 9/10.
4 represents getting 10 out of 10 four times.
so
$10 \times 4 = 40$
but you still have the 9/10 left so you would add the 40/10 to the 9/10 making the number
$\frac{49}{10}$