Practicing subtraction tables is the logical next step in learning basic math operations after tackling the addition tables. This booklet shows tables with a minuend (first number) of 1 through 18 and a subtrahend (second number) of 1 through 9 in numerical order, such that the answer will always be 9 or less (without delving into negatives). For example, the "minuend of three" table shows the problems 3 - 3; 3 - 2; and 3 - 1. The "minuend of sixteen" table shows 16 - 9; 16 - 8; and 16 - 7. The booklet has eighteen pages in total, and is sold in packs of ten booklets.