Just formula things!

Hi mommas my baby is a month old now i havent started formula to my baby until now but as i have to get back to work i have to give formula to my baby once in a day so i gave him a scoop with 30 ml of water but he seems to be hungry still and started crying so i breastfed him for 15 mins and he got back to sleep. Now at night i gave him 1.5 scoop with 40 ml he still tends to be hungry so i breastfed him for another half hour only then he got back to sleep. So my question is that should i add more quantity of formula or is it just the breastfeeding things that he is just used to my nipples? Should i get a pacifier please suggest me a good advice