I just love this resource.
I have had a good read through it and like the simplicity of how concepts arr explained for students.
I am currently teaching Grade 3/4 and think this resource would suit this grade range as well as the lower grades (1/2).
I would start off with using these as focus activities with the class then move onto completing in small teacher groups then if the students are confident in completing the activities, then possibly whole class completion of activities.
The way in which the sheets are set out allows students to read and understand what they are about to cover in their learning.