Tell the students the story of what happened one day with Tommy’s (your puppet's) socks. First of all put up a piece of string across the board, this represents the washing line. I take out socks from Tommy's rucksack, but take them out whatever box/bag your puppet lives in and put them on the line, count them. Encourage your students to count along with you. Tell them the story about how it it was really windy, students make the noise of the wind and one of the socks fall off. Ask students how many socks are left. Then teach them the song (to the tune of 10 green bottles) https://www.youtube.com/watch?v=T0ooQv7oHvw
Ten white socks, hanging on the line Ten white socks, hanging on the line The cold wind blew (kids all blow) and one of them fell off Then there were 9 white socks, hanging on the line.
At the end of the song say “So they all got dirty so I had to wash them again…” and repeat the song. Instead of 'white socks' you can use 'black socks, small socks, smelly socks' etc