In between scuba diving for sunken treasure and snapping photos of rare butterflies, kids discover an unexpected benefit: enjoyable subtraction practice. Subtraction Secrets is jammed with fun, imaginative mysteries that children will love. Kids solve subtraction equations to crack each case, and gain valuable map reading skills as they travel north, south, east and west to find the final answer. This book includes 30 single-page mini-mysteries plus illustrated solutions. It's outstanding for grades 1 to 4, and useful as a springboard for creative writing and other cross-disciplinary applications. Softcover; 48 pages. Reproducible for single classroom use.