My students really enjoy Search and Find style of worksheets. They think its one of the easier worksheets we use, not realizing just how much they are learning from the pages. Being able to immediately identify numbers is an essential skill for children to learn- these pages greatly aid them in honing that skill.
The additional handwriting practice I added to these pages is also non-intimidating. With only one line, they are introduced to writing the number without getting discouraged if its not yet perfect.
Since the beginning of our school year, we've had a "Number of the Week." These pages are how I choose to introduce the new numbers every Monday- this way they can become more familiar with the number before moving on to pages with an increased difficulty level.