Putting letters, or words in abc order or numbers in order. Cheap and brilliant! Great for skip counting, fractions, putting different three-digit numbers in order., all great ways to practice grade CCSS
Counting and Measuring with Lego: Preschool Maths Game - Good way to visually compare numbers - I would suggest making the corresponding numbers (like 5 and 15 or 8 and the same color to help see the pattern relationship between the numbers and 15
Nature inspired craft - Pine Cone Weaving inexpensive but fun. Pupils can start this activity by finding the pine cones themselves. Different weaving materials will give different results great craft activity as well as a finger strenthening activity.
Every child decorates a stone and then adds a weatherproofing varnish. What an amazingly welcoming display! School counselors - could make it a great lesson on diversity & add stones to our school garden