2nd Grade Subtraction Within 20 — Under the Sea Printable Math Worksheet

Make subtraction practice a splashing good time! This **Under the Sea Subtraction Within 20** worksheet is packed with **20 ocean-themed subtraction problems** (differences within 20), fun sea-creature illustrations, and a bonus "color by answer" challenge at the bottom. Perfect for **2nd graders** building fluency with basic subtraction facts. Aligned to 2nd-grade subtraction fluency within 20 skills (Common Core 2.OA.B.2). Great for morning work, homework, or math centers. Print and go — no prep needed! A guaranteed hit for little ocean explorers. 🐠🌊