For the first one it’s 1/4s so the best number would be 3 1/4 then 3 1/2 or 3 2/4 and so fourth... the second line is 8ths so just like the first you will start out with the lowest which would be 1/8 all the way up to 7/8...... the last like is halves so you would start with 1/2 all the way to the end of the row