Today the word I’ve met is cutting a cake into~.
Cutting a cake
I cut a cake into four pieces.
I cut into four quarters.
I quartered a cake.
I cut(split) a cake in half.
I cut a cake into layers.
fraction
1/2=> one half or a half
1/3=> one third or a third
2/3=> two third
1/4=> one fourth or a quarter
1/5=> one 5th(fifth) or a fifth
1/8=> one eighth or an eighth
1/10=> one tenth