Here's something we use all year long. Students use this activity for morning work two to three times a week. You can use the actual school day number or a higher number to make it more challenging. Students create a number web in their math journal to show all 15 ways to show the number.
Other ideas: Roman numerals, 10 more / 10 less, number sentences, tally marks, pictures, temperature (decide if the number would be cold, warm, hot)
Charts are from the dollar section at Target.
Number of the Day poster