Practicing addition tables is often the first step to understanding math and basic math operations. This booklet contains the addition tables for the numbers 1 through 9 where the second addend is shown in numerical order. For example, the first page shows the table for 1 plus 1, 1 plus 2, 1 plus 3 etc. up to 1 plus 9. The next page show 2 plus 1 through to 2 plus 9, and so forth to 9 plus 1 through to 9 plus 9. There are nine pages in each booklet, sold in a pack of ten booklets.