Addition Fact Booklets are designed for use in a Montessori classroom, but they can be used in any classroom or at home. Perfect for pre-K, K (kindergarten), 1st (first), 2nd (second), and 3rd (third) grades. Each booklet represents another tier of difficulty. These Addition Fact Booklets are 1 of 4 booklet sets in our Math Facts Booklets Bundle. Our bundle of all 12 booklets (42 pages of materials!) will save you 20% off the cost of buying each booklet set individually. Click the link for