I have just finished a sequel to our very popular Snake Count Back cards. This set features numbers up to 20.
They are "write'n'wipe" cards - print them, laminate them and then use them with your small groups, over and OVER again! The snake-number-line will help your students to count back to model subtraction. It is such a big step for your K-2 students to move from
using concrete materials to separate part of a group
to solve subtraction. Resources like this, will help you scaffold that step!
This resource is 50% off for the first 24 hours, in my TpT store!