If you are looking for an activity to help your students under place value, then check out this math activity on linking numbers.
Students choose a number card and read the number.
Then they count out the corresponding linking chains to attach to the card. Teen numbers will be shown as ten and ones. The twenty card will be twenty and zero. After linking students can record how many tens and ones each number used.
Common Core Standard: CCSS. Math.Content.K.CC.A.3
Even comes with an I Can poster.
Prep: Print out onto hard stock/tag board. Laminate for durability, cut out and hole punch the black dots for the linking chains. Print out recording sheet.