What this page practices
Every worksheet here is Find and Cross Out, built specifically for Grade 1. The layout, number range, and difficulty are matched to what Grade 1 can reason through independently — not a generic difficulty label, but a puzzle scoped to this exact grade's level.
Fresh puzzles, same skill, every variant
Every numbered worksheet below tests the exact same Find and Cross Out rule with a fresh, deterministically-generated layout — so a child who needs more repetition can work through several variants without ever seeing the identical puzzle twice, and a teacher can hand two students different-looking pages while both practice the same underlying skill.
How to check the answer
Every puzzle format on this site is self-checking by design — the rule needed to verify an answer is either printed on the page itself or plain enough to confirm at a glance, so there's no separate answer key to track down or print alongside this worksheet.