10 worksheets of missing numbers (before and after) from one to twenty for kindergarten, prep and first grade. Complete the sequence! These worksheets are divided into either 1-10 or 10-20 for easy differentiation. Engage and excite your learners with these fun ocean animal themed worksheets, sure to capture their interest! There are a variety of activities where students can shade in pictures/bubbles, write in numbers with crayons or pencils, complete cut and paste activities and fill in missin