The Number of the Day activity helps students understand numbers. It builds number sense. K-1 should pick a number between 1 and 20 to complete the activity. Once they begin to understand number patterns and relationships, they can try numbers up to 99. 2-5 should pick a number between 20 and 999 to complete the activity. We recommend starting with smaller numbers. Once students begin to understand number patterns and relationships, they can try higher and more difficult numbers.